[v6.1] INFO: rcu detected stall in addrconf_rs_timer
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syzbot
May 24, 2024, 2:08:29 PM5/24/24
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 4078fa637fcd Linux 6.1.91
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=16f02784980000
kernel config: https://syzkaller.appspot.com/x/.config?x=715ba80acfd3def4
dashboard link: https://syzkaller.appspot.com/bug?extid=8c2bd9d58eb3944b2c1b
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/20c616b95c1f/disk-4078fa63.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/78c98fa5c5a9/vmlinux-4078fa63.xz
kernel image: https://storage.googleapis.com/syzbot-assets/5dcdafdbe940/bzImage-4078fa63.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8c2bd9...@syzkaller.appspotmail.com
rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-.... } 3469 jiffies s: 3225 root: 0x1/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4420 Comm: syz-executor.4 Not tainted 6.1.91-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:235 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x4/0x80 kernel/kcov.c:311
Code: 89 f8 89 f6 49 ff c2 4c 89 11 48 c7 44 0a 08 05 00 00 00 48 89 44 0a 10 48 89 74 0a 18 4c 89 44 0a 20 c3 0f 1f 00 4c 8b 04 24 <65> 48 8b 0d 04 de 77 7e 65 8b 05 05 de 77 7e a9 00 01 ff 00 74 10
RSP: 0018:ffffc90000006bb8 EFLAGS: 00000046
RAX: ffffffff81b0093e RBX: 0000000000000000 RCX: ffff8880222c5940
RDX: 0000000000010103 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000006cb0 R08: ffffffff81b0094f R09: fffffbfff2093845
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffffc90000006d66 R14: 0000000000000000 R15: ffffc90000006ec0
FS: 00007f576f4346c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbc882d5690 CR3: 00000000602d7000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<NMI>
</NMI>
<IRQ>
perf_prepare_sample+0xe0f/0x1fb0 kernel/events/core.c:7558
__perf_event_output kernel/events/core.c:7655 [inline]
perf_event_output_forward+0x1b7/0x330 kernel/events/core.c:7675
__perf_event_overflow+0x45e/0x640 kernel/events/core.c:9423
perf_swevent_hrtimer+0x38e/0x4f0 kernel/events/core.c:10831
__run_hrtimer kernel/time/hrtimer.c:1686 [inline]
__hrtimer_run_queues+0x5a7/0xe50 kernel/time/hrtimer.c:1750
hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1812
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline]
__sysvec_apic_timer_interrupt+0x156/0x580 arch/x86/kernel/apic/apic.c:1112
sysvec_apic_timer_interrupt+0x3e/0xb0 arch/x86/kernel/apic/apic.c:1106
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:653
RIP: 0010:deref_stack_reg+0x1a8/0x210 arch/x86/kernel/unwind_orc.c:362
Code: c6 48 8b 6c 24 18 48 89 e8 48 c1 e8 03 80 3c 18 00 74 08 48 89 ef e8 e7 45 a5 00 4c 89 75 00 b0 01 48 83 c4 20 5b 41 5c 41 5d <41> 5e 41 5f 5d c3 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c df fe ff
RSP: 0018:ffffc90000007400 EFLAGS: 00000286
RAX: 1ffff92000000e01 RBX: ffffffff8f612100 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffc90000000000 RDI: ffffc900000079e0
RBP: ffffc90000007540 R08: ffffc900000079e0 R09: ffffc90000007550
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffc90000007500
R13: ffffffff8f612102 R14: ffff888028fc4140 R15: ffffc90000008000
unwind_next_frame+0x18db/0x2220
arch_stack_walk+0x10d/0x140 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x113/0x1c0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
__kasan_slab_alloc+0x65/0x70 mm/kasan/common.c:328
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook+0x52/0x3a0 mm/slab.h:737
slab_alloc_node mm/slub.c:3398 [inline]
kmem_cache_alloc_node+0x136/0x310 mm/slub.c:3443
__alloc_skb+0xde/0x670 net/core/skbuff.c:505
alloc_skb include/linux/skbuff.h:1271 [inline]
ndisc_alloc_skb+0xee/0x2c0 net/ipv6/ndisc.c:422
ndisc_send_rs+0x269/0x6a0 net/ipv6/ndisc.c:703
addrconf_rs_timer+0x357/0x610 net/ipv6/addrconf.c:3962
call_timer_fn+0x1ad/0x6b0 kernel/time/timer.c:1504
expire_timers kernel/time/timer.c:1549 [inline]
__run_timers+0x67c/0x890 kernel/time/timer.c:1820
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1833
__do_softirq+0x2e9/0xa4c kernel/softirq.c:571
invoke_softirq kernel/softirq.c:445 [inline]
__irq_exit_rcu+0x155/0x240 kernel/softirq.c:650
irq_exit_rcu+0x5/0x20 kernel/softirq.c:662
sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1106
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:653
RIP: 0010:__sprint_symbol+0xdd/0x3c0 kernel/kallsyms.c:517
Code: 00 4c 89 74 24 10 4c 8d ac 24 a0 00 00 00 48 c7 44 24 60 00 00 00 00 48 8d bc 24 80 00 00 00 48 89 f8 48 c1 e8 03 80 3c 18 00 <74> 05 e8 dc 2f 62 00 48 8d 84 24 c0 00 00 00 48 c7 84 24 80 00 00
RSP: 0018:ffffc9000a4570a0 EFLAGS: 00000246
RAX: 1ffff9200148ae24 RBX: dffffc0000000000 RCX: 0000000000040000
RDX: ffffc900054d2000 RSI: 000000000002fc88 RDI: ffffc9000a457120
RBP: ffffc9000a4571d0 R08: ffffffff8a85ea76 R09: ffffffff8a85ea16
R10: 0000000000000003 R11: ffff8880222c5940 R12: ffffffff860bffff
R13: ffffc9000a457140 R14: ffffc9000a457240 R15: 1ffff9200148ae1c
symbol_string+0x18d/0x3b0 lib/vsprintf.c:1000
pointer+0x7a2/0x1000 lib/vsprintf.c:2403
vsnprintf+0xe5b/0x1c70 lib/vsprintf.c:2809
snprintf+0xd6/0x120 lib/vsprintf.c:2940
bpf_bprintf_prepare+0xb6e/0x1450 kernel/bpf/helpers.c:894
____bpf_snprintf kernel/bpf/helpers.c:1050 [inline]
bpf_snprintf+0x15b/0x260 kernel/bpf/helpers.c:1034
bpf_prog_f2f741945f01d4c6+0x50/0x54
bpf_dispatcher_nop_func include/linux/bpf.h:989 [inline]
__bpf_prog_run include/linux/filter.h:603 [inline]
bpf_prog_run include/linux/filter.h:610 [inline]
bpf_prog_run_pin_on_cpu include/linux/filter.h:627 [inline]
bpf_flow_dissect+0x12d/0x370 net/core/flow_dissector.c:913
bpf_prog_test_run_flow_dissector+0x465/0x7e0 net/bpf/test_run.c:1481
bpf_prog_test_run+0x32f/0x3a0 kernel/bpf/syscall.c:3670
__sys_bpf+0x3eb/0x6c0 kernel/bpf/syscall.c:5023
__do_sys_bpf kernel/bpf/syscall.c:5109 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5107 [inline]
__x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5107
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f576e67cee9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f576f4340c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f576e7abf80 RCX: 00007f576e67cee9
RDX: 0000000000000050 RSI: 0000000020000640 RDI: 000000000000000a
RBP: 00007f576e6c949e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f576e7abf80 R15: 00007ffd54128f88
</TASK>
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: 4078fa637fcd Linux 6.1.91
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=16f02784980000
kernel config: https://syzkaller.appspot.com/x/.config?x=715ba80acfd3def4
dashboard link: https://syzkaller.appspot.com/bug?extid=8c2bd9d58eb3944b2c1b
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/20c616b95c1f/disk-4078fa63.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/78c98fa5c5a9/vmlinux-4078fa63.xz
kernel image: https://storage.googleapis.com/syzbot-assets/5dcdafdbe940/bzImage-4078fa63.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8c2bd9...@syzkaller.appspotmail.com
rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-.... } 3469 jiffies s: 3225 root: 0x1/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4420 Comm: syz-executor.4 Not tainted 6.1.91-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:235 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x4/0x80 kernel/kcov.c:311
Code: 89 f8 89 f6 49 ff c2 4c 89 11 48 c7 44 0a 08 05 00 00 00 48 89 44 0a 10 48 89 74 0a 18 4c 89 44 0a 20 c3 0f 1f 00 4c 8b 04 24 <65> 48 8b 0d 04 de 77 7e 65 8b 05 05 de 77 7e a9 00 01 ff 00 74 10
RSP: 0018:ffffc90000006bb8 EFLAGS: 00000046
RAX: ffffffff81b0093e RBX: 0000000000000000 RCX: ffff8880222c5940
RDX: 0000000000010103 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000006cb0 R08: ffffffff81b0094f R09: fffffbfff2093845
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffffc90000006d66 R14: 0000000000000000 R15: ffffc90000006ec0
FS: 00007f576f4346c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbc882d5690 CR3: 00000000602d7000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<NMI>
</NMI>
<IRQ>
perf_prepare_sample+0xe0f/0x1fb0 kernel/events/core.c:7558
__perf_event_output kernel/events/core.c:7655 [inline]
perf_event_output_forward+0x1b7/0x330 kernel/events/core.c:7675
__perf_event_overflow+0x45e/0x640 kernel/events/core.c:9423
perf_swevent_hrtimer+0x38e/0x4f0 kernel/events/core.c:10831
__run_hrtimer kernel/time/hrtimer.c:1686 [inline]
__hrtimer_run_queues+0x5a7/0xe50 kernel/time/hrtimer.c:1750
hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1812
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline]
__sysvec_apic_timer_interrupt+0x156/0x580 arch/x86/kernel/apic/apic.c:1112
sysvec_apic_timer_interrupt+0x3e/0xb0 arch/x86/kernel/apic/apic.c:1106
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:653
RIP: 0010:deref_stack_reg+0x1a8/0x210 arch/x86/kernel/unwind_orc.c:362
Code: c6 48 8b 6c 24 18 48 89 e8 48 c1 e8 03 80 3c 18 00 74 08 48 89 ef e8 e7 45 a5 00 4c 89 75 00 b0 01 48 83 c4 20 5b 41 5c 41 5d <41> 5e 41 5f 5d c3 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c df fe ff
RSP: 0018:ffffc90000007400 EFLAGS: 00000286
RAX: 1ffff92000000e01 RBX: ffffffff8f612100 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffc90000000000 RDI: ffffc900000079e0
RBP: ffffc90000007540 R08: ffffc900000079e0 R09: ffffc90000007550
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffc90000007500
R13: ffffffff8f612102 R14: ffff888028fc4140 R15: ffffc90000008000
unwind_next_frame+0x18db/0x2220
arch_stack_walk+0x10d/0x140 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x113/0x1c0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
__kasan_slab_alloc+0x65/0x70 mm/kasan/common.c:328
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook+0x52/0x3a0 mm/slab.h:737
slab_alloc_node mm/slub.c:3398 [inline]
kmem_cache_alloc_node+0x136/0x310 mm/slub.c:3443
__alloc_skb+0xde/0x670 net/core/skbuff.c:505
alloc_skb include/linux/skbuff.h:1271 [inline]
ndisc_alloc_skb+0xee/0x2c0 net/ipv6/ndisc.c:422
ndisc_send_rs+0x269/0x6a0 net/ipv6/ndisc.c:703
addrconf_rs_timer+0x357/0x610 net/ipv6/addrconf.c:3962
call_timer_fn+0x1ad/0x6b0 kernel/time/timer.c:1504
expire_timers kernel/time/timer.c:1549 [inline]
__run_timers+0x67c/0x890 kernel/time/timer.c:1820
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1833
__do_softirq+0x2e9/0xa4c kernel/softirq.c:571
invoke_softirq kernel/softirq.c:445 [inline]
__irq_exit_rcu+0x155/0x240 kernel/softirq.c:650
irq_exit_rcu+0x5/0x20 kernel/softirq.c:662
sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1106
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:653
RIP: 0010:__sprint_symbol+0xdd/0x3c0 kernel/kallsyms.c:517
Code: 00 4c 89 74 24 10 4c 8d ac 24 a0 00 00 00 48 c7 44 24 60 00 00 00 00 48 8d bc 24 80 00 00 00 48 89 f8 48 c1 e8 03 80 3c 18 00 <74> 05 e8 dc 2f 62 00 48 8d 84 24 c0 00 00 00 48 c7 84 24 80 00 00
RSP: 0018:ffffc9000a4570a0 EFLAGS: 00000246
RAX: 1ffff9200148ae24 RBX: dffffc0000000000 RCX: 0000000000040000
RDX: ffffc900054d2000 RSI: 000000000002fc88 RDI: ffffc9000a457120
RBP: ffffc9000a4571d0 R08: ffffffff8a85ea76 R09: ffffffff8a85ea16
R10: 0000000000000003 R11: ffff8880222c5940 R12: ffffffff860bffff
R13: ffffc9000a457140 R14: ffffc9000a457240 R15: 1ffff9200148ae1c
symbol_string+0x18d/0x3b0 lib/vsprintf.c:1000
pointer+0x7a2/0x1000 lib/vsprintf.c:2403
vsnprintf+0xe5b/0x1c70 lib/vsprintf.c:2809
snprintf+0xd6/0x120 lib/vsprintf.c:2940
bpf_bprintf_prepare+0xb6e/0x1450 kernel/bpf/helpers.c:894
____bpf_snprintf kernel/bpf/helpers.c:1050 [inline]
bpf_snprintf+0x15b/0x260 kernel/bpf/helpers.c:1034
bpf_prog_f2f741945f01d4c6+0x50/0x54
bpf_dispatcher_nop_func include/linux/bpf.h:989 [inline]
__bpf_prog_run include/linux/filter.h:603 [inline]
bpf_prog_run include/linux/filter.h:610 [inline]
bpf_prog_run_pin_on_cpu include/linux/filter.h:627 [inline]
bpf_flow_dissect+0x12d/0x370 net/core/flow_dissector.c:913
bpf_prog_test_run_flow_dissector+0x465/0x7e0 net/bpf/test_run.c:1481
bpf_prog_test_run+0x32f/0x3a0 kernel/bpf/syscall.c:3670
__sys_bpf+0x3eb/0x6c0 kernel/bpf/syscall.c:5023
__do_sys_bpf kernel/bpf/syscall.c:5109 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5107 [inline]
__x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5107
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f576e67cee9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f576f4340c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f576e7abf80 RCX: 00007f576e67cee9
RDX: 0000000000000050 RSI: 0000000020000640 RDI: 000000000000000a
RBP: 00007f576e6c949e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f576e7abf80 R15: 00007ffd54128f88
</TASK>
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot
Aug 29, 2025, 4:49:33 PM8/29/25
to syzkaller...@googlegroups.com
syzbot has found a reproducer for the following issue on:
HEAD commit: f89b6e15694c Linux 6.1.149
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=15255634580000
kernel config: https://syzkaller.appspot.com/x/.config?x=115cdcc5760d448b
dashboard link: https://syzkaller.appspot.com/bug?extid=8c2bd9d58eb3944b2c1b
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13e5fef0580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1476f262580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/d50897075012/disk-f89b6e15.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/be1ee22a32ec/vmlinux-f89b6e15.xz
kernel image: https://storage.googleapis.com/syzbot-assets/f434e015cacd/bzImage-f89b6e15.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8c2bd9...@syzkaller.appspotmail.com
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-...!: (1 GPs behind) idle=293c/1/0x4000000000000000 softirq=10609/10610 fqs=7
(t=10502 jiffies g=9189 q=1016 ncpus=2)
rcu: rcu_preempt kthread starved for 10150 jiffies! g9189 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt state:R running task stack:27840 pid:16 ppid:2 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10ec/0x40b0 kernel/sched/core.c:6561
schedule+0xb9/0x180 kernel/sched/core.c:6637
schedule_timeout+0x15c/0x280 kernel/time/timer.c:1965
rcu_gp_fqs_loop+0x2f2/0x1310 kernel/rcu/tree.c:1706
rcu_gp_kthread+0x95/0x380 kernel/rcu/tree.c:1905
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>
rcu: Stack dump where RCU GP kthread last ran:
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:__kasan_check_read+0x6/0x10 mm/kasan/shadow.c:31
Code: 41 5f 5d c3 48 c7 c7 33 73 5a 8c eb 0a 48 c7 c7 cc bc 43 8c 48 89 de e8 38 48 3b 08 31 ed eb d7 00 00 cc cc 89 f6 48 8b 0c 24 <31> d2 e9 a3 ec ff ff 0f 1f 00 89 f6 48 8b 0c 24 ba 01 00 00 00 e9
RSP: 0018:ffffc90000006a98 EFLAGS: 00000002
RAX: 0000000000000008 RBX: ffff88802a0bd940 RCX: ffffffff8163aab4
RDX: 0000000000000008 RSI: 0000000000000008 RDI: ffffffff90ae1248
RBP: 0000000000000009 R08: dffffc0000000000 R09: fffffbfff215c24a
R10: fffffbfff215c24a R11: 1ffffffff215c249 R12: 0000000000000200
R13: dffffc0000000000 R14: ffff88802a0be4c0 R15: 0000000000000048
FS: 00007f07724d36c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
instrument_atomic_read include/linux/instrumented.h:72 [inline]
_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
hlock_class kernel/locking/lockdep.c:228 [inline]
mark_lock+0x94/0x320 kernel/locking/lockdep.c:4606
mark_usage kernel/locking/lockdep.c:4549 [inline]
__lock_acquire+0xd6f/0x7c50 kernel/locking/lockdep.c:5003
lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662
seqcount_lockdep_reader_access+0xc6/0x1c0 include/linux/seqlock.h:102
timekeeping_get_delta kernel/time/timekeeping.c:254 [inline]
timekeeping_get_ns kernel/time/timekeeping.c:388 [inline]
ktime_get+0x7b/0x270 kernel/time/timekeeping.c:848
hrtimer_forward_now include/linux/hrtimer.h:509 [inline]
perf_swevent_hrtimer+0x435/0x500 kernel/events/core.c:10932
__run_hrtimer kernel/time/hrtimer.c:1752 [inline]
__hrtimer_run_queues+0x515/0xd60 kernel/time/hrtimer.c:1816
hrtimer_interrupt+0x3c5/0x9c0 kernel/time/hrtimer.c:1878
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
__sysvec_apic_timer_interrupt+0x153/0x5a0 arch/x86/kernel/apic/apic.c:1124
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0x4d/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:seqcount_lockdep_reader_access+0x17b/0x1c0 include/linux/seqlock.h:105
Code: 00 4d 85 e4 75 16 e8 04 8f 0f 00 eb 15 e8 fd 8e 0f 00 e8 88 01 a6 08 4d 85 e4 74 ea e8 ee 8e 0f 00 fb 48 c7 04 24 0e 36 e0 45 <4b> c7 04 3e 00 00 00 00 66 43 c7 44 3e 09 00 00 43 c6 44 3e 0b 00
RSP: 0018:ffffc90000007560 EFLAGS: 00000246
RAX: ffffffff81714132 RBX: 0000000000000000 RCX: ffff88802a0bd940
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000007618 R08: dffffc0000000000 R09: fffffbfff215c26a
R10: fffffbfff215c26a R11: 1ffffffff215c269 R12: 0000000000000200
R13: 00000060b362f683 R14: 1ffff92000000eac R15: dffffc0000000000
timekeeping_get_delta kernel/time/timekeeping.c:254 [inline]
timekeeping_get_ns kernel/time/timekeeping.c:388 [inline]
ktime_get+0x7b/0x270 kernel/time/timekeeping.c:848
ktime_get_ns include/linux/timekeeping.h:154 [inline]
neigh_forced_gc net/core/neighbour.c:257 [inline]
neigh_alloc net/core/neighbour.c:486 [inline]
___neigh_create+0x190/0x24c0 net/core/neighbour.c:649
ip6_finish_output2+0x14f0/0x1590 net/ipv6/ip6_output.c:129
dst_output include/net/dst.h:453 [inline]
NF_HOOK include/linux/netfilter.h:302 [inline]
ndisc_send_skb+0xbfb/0x1510 net/ipv6/ndisc.c:513
addrconf_rs_timer+0x2b8/0x600 net/ipv6/addrconf.c:3979
call_timer_fn+0x1a0/0x670 kernel/time/timer.c:1504
expire_timers kernel/time/timer.c:1549 [inline]
__run_timers+0x525/0x7c0 kernel/time/timer.c:1820
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1833
handle_softirqs+0x2a1/0x920 kernel/softirq.c:596
__do_softirq kernel/softirq.c:630 [inline]
invoke_softirq kernel/softirq.c:470 [inline]
__irq_exit_rcu+0x12f/0x220 kernel/softirq.c:679
irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:finish_task_switch+0x26a/0x8f0 kernel/sched/core.c:5123
Code: 0f 84 3b 01 00 00 48 85 db 0f 85 5a 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 10 e0 c8 08 e8 cb b2 2e 00 fb 4c 8b 65 c0 <49> 8d bc 24 f8 15 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc90003847458 EFLAGS: 00000282
RAX: e66cc4c18c5bca00 RBX: 0000000000000000 RCX: e66cc4c18c5bca00
RDX: dffffc0000000000 RSI: ffffffff8a8c0300 RDI: ffffffff8adefae0
RBP: ffffc900038474b0 R08: dffffc0000000000 R09: fffffbfff215c24f
R10: fffffbfff215c24f R11: 1ffffffff215c24e R12: ffff88802a0bd940
R13: dffffc0000000000 R14: ffff8880305a9dc0 R15: ffff8880b8e3b550
context_switch kernel/sched/core.c:5247 [inline]
__schedule+0x10f4/0x40b0 kernel/sched/core.c:6561
preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6873
irqentry_exit+0x63/0x70 kernel/entry/common.c:439
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:lock_is_held_type+0x13a/0x190 kernel/locking/lockdep.c:5710
Code: 75 40 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 46 41 f7 c5 00 02 00 00 74 01 fb 65 48 8b 04 25 28 00 00 00 <48> 3b 44 24 08 75 3c 89 e8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffffc900038477c8 EFLAGS: 00000206
RAX: e66cc4c18c5bca00 RBX: ffff88802a0bd940 RCX: e66cc4c18c5bca00
RDX: 0000000000000000 RSI: ffffffff8a8c1480 RDI: ffffffff8adefae0
RBP: 0000000000000001 R08: ffff88802a0bd940 R09: 0000000000000003
R10: 0000000000000011 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000246 R14: ffff888030002e58 R15: ffff88802a0be420
lock_is_held include/linux/lockdep.h:283 [inline]
mt_locked lib/maple_tree.c:-1 [inline]
mas_root lib/maple_tree.c:858 [inline]
mas_start+0x19d/0x460 lib/maple_tree.c:1399
mas_state_walk lib/maple_tree.c:3894 [inline]
mas_walk+0x2f/0x180 lib/maple_tree.c:5137
mas_find+0x1db/0x230 lib/maple_tree.c:6107
vma_find include/linux/mm.h:690 [inline]
vma_next include/linux/mm.h:699 [inline]
acct_collect+0x172/0x730 kernel/acct.c:599
do_exit+0x845/0x2400 kernel/exit.c:850
do_group_exit+0x217/0x2d0 kernel/exit.c:1022
get_signal+0x1272/0x1350 kernel/signal.c:2871
arch_do_signal_or_restart+0xb0/0x1230 arch/x86/kernel/signal.c:871
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:316
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0033:0x7ffda94b3954
Code: b8 01 00 00 00 89 f9 d3 e0 a9 83 08 00 00 0f 84 ef 00 00 00 4c 8d 35 3b b7 ff ff 41 89 fc 49 c1 e4 04 4b 8d 5c 26 20 45 8b 3e <41> f6 c7 01 75 3b 41 8b 46 04 83 f8 01 75 44 0f 01 f9 66 90 48 c1
RSP: 002b:00007f07724d3000 EFLAGS: 00000202
RAX: 0000000000000002 RBX: 00007ffda94af0b0 RCX: 0000000000000001
RDX: 00007f077169a540 RSI: 00007f07724d30b0 RDI: 0000000000000001
RBP: 00007f07724d3040 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000010
R13: 00007f07717b6038 R14: 00007ffda94af080 R15: 00000000000039c4
</TASK>
CPU: 1 PID: 4583 Comm: syz.2.50 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:seqcount_lockdep_reader_access+0x17b/0x1c0 include/linux/seqlock.h:105
Code: 00 4d 85 e4 75 16 e8 04 8f 0f 00 eb 15 e8 fd 8e 0f 00 e8 88 01 a6 08 4d 85 e4 74 ea e8 ee 8e 0f 00 fb 48 c7 04 24 0e 36 e0 45 <4b> c7 04 3e 00 00 00 00 66 43 c7 44 3e 09 00 00 43 c6 44 3e 0b 00
RSP: 0018:ffffc900001e01e0 EFLAGS: 00000246
RAX: ffffffff81714132 RBX: 0000000000000000 RCX: ffff88802a0bbb80
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900001e0298 R08: dffffc0000000000 R09: fffffbfff215c26a
R10: fffffbfff215c26a R11: 1ffffffff215c269 R12: 0000000000000200
R13: 000001fb63109b96 R14: 1ffff9200003c03c R15: dffffc0000000000
FS: 00007f88a11e06c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
timekeeping_get_delta kernel/time/timekeeping.c:254 [inline]
timekeeping_get_ns kernel/time/timekeeping.c:388 [inline]
ktime_get_with_offset+0xff/0x320 kernel/time/timekeeping.c:891
ktime_get_real include/linux/timekeeping.h:79 [inline]
netif_rx_internal+0x398/0x560 net/core/dev.c:5023
__netif_rx+0x74/0xb0 net/core/dev.c:5066
veth_forward_skb drivers/net/veth.c:290 [inline]
veth_xmit+0x650/0xb00 drivers/net/veth.c:343
__netdev_start_xmit include/linux/netdevice.h:4896 [inline]
netdev_start_xmit include/linux/netdevice.h:4910 [inline]
xmit_one net/core/dev.c:3670 [inline]
dev_hard_start_xmit+0x262/0x870 net/core/dev.c:3686
__dev_queue_xmit+0x1bf1/0x3760 net/core/dev.c:4346
dev_queue_xmit include/linux/netdevice.h:3051 [inline]
neigh_hh_output include/net/neighbour.h:529 [inline]
neigh_output include/net/neighbour.h:543 [inline]
ip6_finish_output2+0xd6b/0x1590 net/ipv6/ip6_output.c:138
dst_output include/net/dst.h:453 [inline]
NF_HOOK include/linux/netfilter.h:302 [inline]
ndisc_send_skb+0xbfb/0x1510 net/ipv6/ndisc.c:513
addrconf_rs_timer+0x2b8/0x600 net/ipv6/addrconf.c:3979
call_timer_fn+0x1a0/0x670 kernel/time/timer.c:1504
expire_timers kernel/time/timer.c:1549 [inline]
__run_timers+0x525/0x7c0 kernel/time/timer.c:1820
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1833
handle_softirqs+0x2a1/0x920 kernel/softirq.c:596
__do_softirq kernel/softirq.c:630 [inline]
invoke_softirq kernel/softirq.c:470 [inline]
__irq_exit_rcu+0x12f/0x220 kernel/softirq.c:679
irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:lock_acquire+0x20f/0x490 kernel/locking/lockdep.c:5666
Code: 00 9c 8f 84 24 80 00 00 00 f6 84 24 81 00 00 00 02 0f 85 f5 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 44 3d 00 00 00 00 00 66 43 c7 44 3d 09 00 00 43 c6 44 3d 0b
RSP: 0018:ffffc900037b7900 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 2c9a596a6974a000
RDX: 0000000000000000 RSI: ffffffff8a8c1480 RDI: ffffffff8adefae0
RBP: ffffc900037b7a20 R08: dffffc0000000000 R09: fffffbfff215c262
R10: fffffbfff215c262 R11: 1ffffffff215c261 R12: 0000000000000001
R13: 1ffff920006f6f2c R14: 0000000000000246 R15: dffffc0000000000
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:351 [inline]
futex_q_lock+0x1a6/0x240 kernel/futex/core.c:542
futex_wait_setup+0xd9/0x260 kernel/futex/waitwake.c:607
futex_wait+0x16e/0x530 kernel/futex/waitwake.c:651
do_futex+0x310/0x320 kernel/futex/syscalls.c:106
__do_sys_futex kernel/futex/syscalls.c:183 [inline]
__se_sys_futex+0x14a/0x440 kernel/futex/syscalls.c:164
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f88a038ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f88a11e00e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f88a05b5fa8 RCX: 00007f88a038ebe9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f88a05b5fa8
RBP: 00007f88a05b5fa0 R08: 0000000000000000 R09: 0000000000000000
</TASK>
---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
HEAD commit: f89b6e15694c Linux 6.1.149
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=15255634580000
kernel config: https://syzkaller.appspot.com/x/.config?x=115cdcc5760d448b
dashboard link: https://syzkaller.appspot.com/bug?extid=8c2bd9d58eb3944b2c1b
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13e5fef0580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1476f262580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/d50897075012/disk-f89b6e15.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/be1ee22a32ec/vmlinux-f89b6e15.xz
kernel image: https://storage.googleapis.com/syzbot-assets/f434e015cacd/bzImage-f89b6e15.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8c2bd9...@syzkaller.appspotmail.com
rcu: 1-...!: (1 GPs behind) idle=293c/1/0x4000000000000000 softirq=10609/10610 fqs=7
(t=10502 jiffies g=9189 q=1016 ncpus=2)
rcu: rcu_preempt kthread starved for 10150 jiffies! g9189 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt state:R running task stack:27840 pid:16 ppid:2 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10ec/0x40b0 kernel/sched/core.c:6561
schedule+0xb9/0x180 kernel/sched/core.c:6637
schedule_timeout+0x15c/0x280 kernel/time/timer.c:1965
rcu_gp_fqs_loop+0x2f2/0x1310 kernel/rcu/tree.c:1706
rcu_gp_kthread+0x95/0x380 kernel/rcu/tree.c:1905
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4581 Comm: syz.3.49 Not tainted syzkaller #0
NMI backtrace for cpu 0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:__kasan_check_read+0x6/0x10 mm/kasan/shadow.c:31
Code: 41 5f 5d c3 48 c7 c7 33 73 5a 8c eb 0a 48 c7 c7 cc bc 43 8c 48 89 de e8 38 48 3b 08 31 ed eb d7 00 00 cc cc 89 f6 48 8b 0c 24 <31> d2 e9 a3 ec ff ff 0f 1f 00 89 f6 48 8b 0c 24 ba 01 00 00 00 e9
RSP: 0018:ffffc90000006a98 EFLAGS: 00000002
RAX: 0000000000000008 RBX: ffff88802a0bd940 RCX: ffffffff8163aab4
RDX: 0000000000000008 RSI: 0000000000000008 RDI: ffffffff90ae1248
RBP: 0000000000000009 R08: dffffc0000000000 R09: fffffbfff215c24a
R10: fffffbfff215c24a R11: 1ffffffff215c249 R12: 0000000000000200
R13: dffffc0000000000 R14: ffff88802a0be4c0 R15: 0000000000000048
FS: 00007f07724d36c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f07715f8958 CR3: 000000005c860000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
instrument_atomic_read include/linux/instrumented.h:72 [inline]
_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
hlock_class kernel/locking/lockdep.c:228 [inline]
mark_lock+0x94/0x320 kernel/locking/lockdep.c:4606
mark_usage kernel/locking/lockdep.c:4549 [inline]
__lock_acquire+0xd6f/0x7c50 kernel/locking/lockdep.c:5003
lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662
seqcount_lockdep_reader_access+0xc6/0x1c0 include/linux/seqlock.h:102
timekeeping_get_delta kernel/time/timekeeping.c:254 [inline]
timekeeping_get_ns kernel/time/timekeeping.c:388 [inline]
ktime_get+0x7b/0x270 kernel/time/timekeeping.c:848
hrtimer_forward_now include/linux/hrtimer.h:509 [inline]
perf_swevent_hrtimer+0x435/0x500 kernel/events/core.c:10932
__run_hrtimer kernel/time/hrtimer.c:1752 [inline]
__hrtimer_run_queues+0x515/0xd60 kernel/time/hrtimer.c:1816
hrtimer_interrupt+0x3c5/0x9c0 kernel/time/hrtimer.c:1878
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
__sysvec_apic_timer_interrupt+0x153/0x5a0 arch/x86/kernel/apic/apic.c:1124
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0x4d/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:seqcount_lockdep_reader_access+0x17b/0x1c0 include/linux/seqlock.h:105
Code: 00 4d 85 e4 75 16 e8 04 8f 0f 00 eb 15 e8 fd 8e 0f 00 e8 88 01 a6 08 4d 85 e4 74 ea e8 ee 8e 0f 00 fb 48 c7 04 24 0e 36 e0 45 <4b> c7 04 3e 00 00 00 00 66 43 c7 44 3e 09 00 00 43 c6 44 3e 0b 00
RSP: 0018:ffffc90000007560 EFLAGS: 00000246
RAX: ffffffff81714132 RBX: 0000000000000000 RCX: ffff88802a0bd940
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000007618 R08: dffffc0000000000 R09: fffffbfff215c26a
R10: fffffbfff215c26a R11: 1ffffffff215c269 R12: 0000000000000200
R13: 00000060b362f683 R14: 1ffff92000000eac R15: dffffc0000000000
timekeeping_get_delta kernel/time/timekeeping.c:254 [inline]
timekeeping_get_ns kernel/time/timekeeping.c:388 [inline]
ktime_get+0x7b/0x270 kernel/time/timekeeping.c:848
ktime_get_ns include/linux/timekeeping.h:154 [inline]
neigh_forced_gc net/core/neighbour.c:257 [inline]
neigh_alloc net/core/neighbour.c:486 [inline]
___neigh_create+0x190/0x24c0 net/core/neighbour.c:649
ip6_finish_output2+0x14f0/0x1590 net/ipv6/ip6_output.c:129
dst_output include/net/dst.h:453 [inline]
NF_HOOK include/linux/netfilter.h:302 [inline]
ndisc_send_skb+0xbfb/0x1510 net/ipv6/ndisc.c:513
addrconf_rs_timer+0x2b8/0x600 net/ipv6/addrconf.c:3979
call_timer_fn+0x1a0/0x670 kernel/time/timer.c:1504
expire_timers kernel/time/timer.c:1549 [inline]
__run_timers+0x525/0x7c0 kernel/time/timer.c:1820
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1833
handle_softirqs+0x2a1/0x920 kernel/softirq.c:596
__do_softirq kernel/softirq.c:630 [inline]
invoke_softirq kernel/softirq.c:470 [inline]
__irq_exit_rcu+0x12f/0x220 kernel/softirq.c:679
irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:finish_task_switch+0x26a/0x8f0 kernel/sched/core.c:5123
Code: 0f 84 3b 01 00 00 48 85 db 0f 85 5a 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 10 e0 c8 08 e8 cb b2 2e 00 fb 4c 8b 65 c0 <49> 8d bc 24 f8 15 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc90003847458 EFLAGS: 00000282
RAX: e66cc4c18c5bca00 RBX: 0000000000000000 RCX: e66cc4c18c5bca00
RDX: dffffc0000000000 RSI: ffffffff8a8c0300 RDI: ffffffff8adefae0
RBP: ffffc900038474b0 R08: dffffc0000000000 R09: fffffbfff215c24f
R10: fffffbfff215c24f R11: 1ffffffff215c24e R12: ffff88802a0bd940
R13: dffffc0000000000 R14: ffff8880305a9dc0 R15: ffff8880b8e3b550
context_switch kernel/sched/core.c:5247 [inline]
__schedule+0x10f4/0x40b0 kernel/sched/core.c:6561
preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6873
irqentry_exit+0x63/0x70 kernel/entry/common.c:439
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:lock_is_held_type+0x13a/0x190 kernel/locking/lockdep.c:5710
Code: 75 40 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 46 41 f7 c5 00 02 00 00 74 01 fb 65 48 8b 04 25 28 00 00 00 <48> 3b 44 24 08 75 3c 89 e8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffffc900038477c8 EFLAGS: 00000206
RAX: e66cc4c18c5bca00 RBX: ffff88802a0bd940 RCX: e66cc4c18c5bca00
RDX: 0000000000000000 RSI: ffffffff8a8c1480 RDI: ffffffff8adefae0
RBP: 0000000000000001 R08: ffff88802a0bd940 R09: 0000000000000003
R10: 0000000000000011 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000246 R14: ffff888030002e58 R15: ffff88802a0be420
lock_is_held include/linux/lockdep.h:283 [inline]
mt_locked lib/maple_tree.c:-1 [inline]
mas_root lib/maple_tree.c:858 [inline]
mas_start+0x19d/0x460 lib/maple_tree.c:1399
mas_state_walk lib/maple_tree.c:3894 [inline]
mas_walk+0x2f/0x180 lib/maple_tree.c:5137
mas_find+0x1db/0x230 lib/maple_tree.c:6107
vma_find include/linux/mm.h:690 [inline]
vma_next include/linux/mm.h:699 [inline]
acct_collect+0x172/0x730 kernel/acct.c:599
do_exit+0x845/0x2400 kernel/exit.c:850
do_group_exit+0x217/0x2d0 kernel/exit.c:1022
get_signal+0x1272/0x1350 kernel/signal.c:2871
arch_do_signal_or_restart+0xb0/0x1230 arch/x86/kernel/signal.c:871
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:316
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0033:0x7ffda94b3954
Code: b8 01 00 00 00 89 f9 d3 e0 a9 83 08 00 00 0f 84 ef 00 00 00 4c 8d 35 3b b7 ff ff 41 89 fc 49 c1 e4 04 4b 8d 5c 26 20 45 8b 3e <41> f6 c7 01 75 3b 41 8b 46 04 83 f8 01 75 44 0f 01 f9 66 90 48 c1
RSP: 002b:00007f07724d3000 EFLAGS: 00000202
RAX: 0000000000000002 RBX: 00007ffda94af0b0 RCX: 0000000000000001
RDX: 00007f077169a540 RSI: 00007f07724d30b0 RDI: 0000000000000001
RBP: 00007f07724d3040 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000010
R13: 00007f07717b6038 R14: 00007ffda94af080 R15: 00000000000039c4
</TASK>
CPU: 1 PID: 4583 Comm: syz.2.50 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:seqcount_lockdep_reader_access+0x17b/0x1c0 include/linux/seqlock.h:105
Code: 00 4d 85 e4 75 16 e8 04 8f 0f 00 eb 15 e8 fd 8e 0f 00 e8 88 01 a6 08 4d 85 e4 74 ea e8 ee 8e 0f 00 fb 48 c7 04 24 0e 36 e0 45 <4b> c7 04 3e 00 00 00 00 66 43 c7 44 3e 09 00 00 43 c6 44 3e 0b 00
RSP: 0018:ffffc900001e01e0 EFLAGS: 00000246
RAX: ffffffff81714132 RBX: 0000000000000000 RCX: ffff88802a0bbb80
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900001e0298 R08: dffffc0000000000 R09: fffffbfff215c26a
R10: fffffbfff215c26a R11: 1ffffffff215c269 R12: 0000000000000200
R13: 000001fb63109b96 R14: 1ffff9200003c03c R15: dffffc0000000000
FS: 00007f88a11e06c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000000 CR3: 00000000300b4000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
timekeeping_get_delta kernel/time/timekeeping.c:254 [inline]
timekeeping_get_ns kernel/time/timekeeping.c:388 [inline]
ktime_get_with_offset+0xff/0x320 kernel/time/timekeeping.c:891
ktime_get_real include/linux/timekeeping.h:79 [inline]
netif_rx_internal+0x398/0x560 net/core/dev.c:5023
__netif_rx+0x74/0xb0 net/core/dev.c:5066
veth_forward_skb drivers/net/veth.c:290 [inline]
veth_xmit+0x650/0xb00 drivers/net/veth.c:343
__netdev_start_xmit include/linux/netdevice.h:4896 [inline]
netdev_start_xmit include/linux/netdevice.h:4910 [inline]
xmit_one net/core/dev.c:3670 [inline]
dev_hard_start_xmit+0x262/0x870 net/core/dev.c:3686
__dev_queue_xmit+0x1bf1/0x3760 net/core/dev.c:4346
dev_queue_xmit include/linux/netdevice.h:3051 [inline]
neigh_hh_output include/net/neighbour.h:529 [inline]
neigh_output include/net/neighbour.h:543 [inline]
ip6_finish_output2+0xd6b/0x1590 net/ipv6/ip6_output.c:138
dst_output include/net/dst.h:453 [inline]
NF_HOOK include/linux/netfilter.h:302 [inline]
ndisc_send_skb+0xbfb/0x1510 net/ipv6/ndisc.c:513
addrconf_rs_timer+0x2b8/0x600 net/ipv6/addrconf.c:3979
call_timer_fn+0x1a0/0x670 kernel/time/timer.c:1504
expire_timers kernel/time/timer.c:1549 [inline]
__run_timers+0x525/0x7c0 kernel/time/timer.c:1820
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1833
handle_softirqs+0x2a1/0x920 kernel/softirq.c:596
__do_softirq kernel/softirq.c:630 [inline]
invoke_softirq kernel/softirq.c:470 [inline]
__irq_exit_rcu+0x12f/0x220 kernel/softirq.c:679
irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:lock_acquire+0x20f/0x490 kernel/locking/lockdep.c:5666
Code: 00 9c 8f 84 24 80 00 00 00 f6 84 24 81 00 00 00 02 0f 85 f5 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 44 3d 00 00 00 00 00 66 43 c7 44 3d 09 00 00 43 c6 44 3d 0b
RSP: 0018:ffffc900037b7900 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 2c9a596a6974a000
RDX: 0000000000000000 RSI: ffffffff8a8c1480 RDI: ffffffff8adefae0
RBP: ffffc900037b7a20 R08: dffffc0000000000 R09: fffffbfff215c262
R10: fffffbfff215c262 R11: 1ffffffff215c261 R12: 0000000000000001
R13: 1ffff920006f6f2c R14: 0000000000000246 R15: dffffc0000000000
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:351 [inline]
futex_q_lock+0x1a6/0x240 kernel/futex/core.c:542
futex_wait_setup+0xd9/0x260 kernel/futex/waitwake.c:607
futex_wait+0x16e/0x530 kernel/futex/waitwake.c:651
do_futex+0x310/0x320 kernel/futex/syscalls.c:106
__do_sys_futex kernel/futex/syscalls.c:183 [inline]
__se_sys_futex+0x14a/0x440 kernel/futex/syscalls.c:164
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f88a038ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f88a11e00e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f88a05b5fa8 RCX: 00007f88a038ebe9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f88a05b5fa8
RBP: 00007f88a05b5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f88a05b6038 R14: 00007fff1556cd80 R15: 00007fff1556ce68
</TASK>
---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
syzbot
Dec 20, 2025, 12:25:03 AM12/20/25
to syzkaller...@googlegroups.com
syzbot suspects this issue could be fixed by backporting the following commit:
commit f4bf3ca2e5cba655824b6e0893a98dfb33ed24e5
git tree: upstream
Author: Lingutla Chandrasekhar <clin...@codeaurora.org>
Date: Fri Apr 7 23:05:26 2023 +0000
softirq: Add trace points for tasklet entry/exit
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=10b41db4580000
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
commit f4bf3ca2e5cba655824b6e0893a98dfb33ed24e5
git tree: upstream
Author: Lingutla Chandrasekhar <clin...@codeaurora.org>
Date: Fri Apr 7 23:05:26 2023 +0000
softirq: Add trace points for tasklet entry/exit
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=10b41db4580000
kernel config: https://syzkaller.appspot.com/x/.config?x=115cdcc5760d448b
dashboard link: https://syzkaller.appspot.com/bug?extid=8c2bd9d58eb3944b2c1b
dashboard link: https://syzkaller.appspot.com/bug?extid=8c2bd9d58eb3944b2c1b
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13e5fef0580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1476f262580000
Please keep in mind that other backports might be required as well.
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1476f262580000
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot
Dec 23, 2025, 7:33:04 PM12/23/25
to syzkaller...@googlegroups.com
The commit that was suspected to fix the issue was backported to the fuzzed
kernel trees.
commit 4443fc58fcc283a9a7aa73f2f30e427296612ec7
Author: <sumanth...@yahoo.com>
Date: Wed Nov 12 03:16:20 2025 +0000
softirq: Add trace points for tasklet entry/exit
If you believe this is correct, please reply with
#syz fix: softirq: Add trace points for tasklet entry/exit
The commit was initially detected here:
kernel trees.
commit 4443fc58fcc283a9a7aa73f2f30e427296612ec7
Author: <sumanth...@yahoo.com>
Date: Wed Nov 12 03:16:20 2025 +0000
softirq: Add trace points for tasklet entry/exit
#syz fix: softirq: Add trace points for tasklet entry/exit
The commit was initially detected here:
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