[v6.1] INFO: rcu detected stall in dccp_setsockopt
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syzbot
6:26 AM (11 hours ago) 6:26 AM
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 779f9571ac3e Linux 6.1.164
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=106d30ba580000
kernel config: https://syzkaller.appspot.com/x/.config?x=f0605c5af04d7603
dashboard link: https://syzkaller.appspot.com/bug?extid=11e6e26fa369d98f5a71
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/d8bc7a0c33a8/disk-779f9571.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/870b0bf266c7/vmlinux-779f9571.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ce1e3301c41d/bzImage-779f9571.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+11e6e2...@syzkaller.appspotmail.com
rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 2666 jiffies s: 204769 root: 0x2/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4036 Comm: syz.0.8521 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:rcu_dynticks_curr_cpu_in_eqs include/linux/context_tracking.h:122 [inline]
RIP: 0010:ct_nmi_exit+0x59/0x1c0 kernel/context_tracking.c:215
Code: 65 48 8b 05 61 a8 d6 75 48 85 c0 0f 8e 19 01 00 00 e8 5b 0a 00 00 41 89 c6 83 f8 08 0f 83 2a 01 00 00 4a 8b 04 f5 80 f9 64 8c <f7> 80 08 58 03 00 04 00 00 00 0f 84 f7 00 00 00 48 c7 c7 40 df 94
RSP: 0018:ffffc900001e08e8 EFLAGS: 00000097
RAX: ffff8880b8f00000 RBX: ffff8880b8f35800 RCX: 5b7b902b26d45600
RDX: 0000000000000100 RSI: ffffffff8adf0dc0 RDI: ffffffff8adf0d80
RBP: ffffc900001e09a8 R08: ffffffff8e1fcd2f R09: 1ffffffff1c3f9a5
R10: dffffc0000000000 R11: fffffbfff1c3f9a6 R12: dffffc0000000000
R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000000
FS: 00007ffa565016c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f614f1e6158 CR3: 0000000081caa000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000200000000300
DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
<IRQ>
ct_irq_exit_irqson+0xaf/0x170 kernel/context_tracking.c:422
trace_irq_enable_rcuidle+0xd8/0x140 include/trace/events/preemptirq.h:40
trace_hardirqs_on+0x24/0x40 kernel/trace/trace_preemptirq.c:44
asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:rcu_read_unlock_special+0x7f/0x510 kernel/rcu/tree_plugin.h:685
Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 92 31 95 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc900001e0aa0 EFLAGS: 00000206
RAX: 5b7b902b26d45600 RBX: 1ffff9200003c15c RCX: 5b7b902b26d45600
RDX: dffffc0000000000 RSI: ffffffff8a8c1220 RDI: ffffffff8adf0de0
RBP: ffffc900001e0b90 R08: ffffffff90af5247 R09: 1ffffffff215ea48
R10: dffffc0000000000 R11: fffffbfff215ea49 R12: 0000000000000246
R13: dffffc0000000000 R14: ffff8880b8f3b900 R15: 0000000000000002
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
rcu_read_unlock include/linux/rcupdate.h:823 [inline]
ieee80211_iterate_active_interfaces_atomic+0x156/0x170 net/mac80211/util.c:826
mac80211_hwsim_beacon+0xb7/0x1b0 drivers/net/wireless/mac80211_hwsim.c:2147
__run_hrtimer kernel/time/hrtimer.c:1747 [inline]
__hrtimer_run_queues+0x560/0xd70 kernel/time/hrtimer.c:1811
hrtimer_run_softirq+0x183/0x2a0 kernel/time/hrtimer.c:1828
handle_softirqs+0x2a1/0x930 kernel/softirq.c:596
__do_softirq kernel/softirq.c:630 [inline]
invoke_softirq kernel/softirq.c:470 [inline]
__irq_exit_rcu+0x13b/0x230 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:console_emit_next_record+0x970/0xba0 kernel/printk/printk.c:2786
Code: 0f 85 a7 00 00 00 e8 8f a9 1a 00 0f b6 5c 24 0f 4d 85 e4 75 07 e8 80 a9 1a 00 eb 06 e8 79 a9 1a 00 fb 66 43 c7 44 3d 24 f8 f8 <43> c6 44 3d 26 f8 49 81 c6 00 06 06 06 4f 89 74 3d 14 66 43 c7 44
RSP: 0018:ffffc9000d387920 EFLAGS: 00000287
RAX: ffffffff8167cba7 RBX: 0000000000000001 RCX: 0000000000080000
RDX: ffffc90020a02000 RSI: 0000000000001c69 RDI: 0000000000001c6a
RBP: ffffc9000d387b40 R08: ffffffff90af5247 R09: 1ffffffff215ea48
R10: dffffc0000000000 R11: fffffbfff215ea49 R12: 0000000000000200
R13: 1ffff92001a70f30 R14: f8f8f8f8f2f2f2f8 R15: dffffc0000000000
console_flush_all kernel/printk/printk.c:-1 [inline]
console_unlock+0x223/0x630 kernel/printk/printk.c:2906
vprintk_emit+0x4b3/0x6a0 kernel/printk/printk.c:2303
_printk+0xda/0x130 kernel/printk/printk.c:2328
do_dccp_setsockopt net/dccp/proto.c:-1 [inline]
dccp_setsockopt+0x5b7/0x840 net/dccp/proto.c:579
__sys_setsockopt+0x2bf/0x3d0 net/socket.c:2287
__do_sys_setsockopt net/socket.c:2298 [inline]
__se_sys_setsockopt net/socket.c:2295 [inline]
__x64_sys_setsockopt+0xb1/0xc0 net/socket.c:2295
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7ffa5559c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffa56501028 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007ffa55815fa0 RCX: 00007ffa5559c799
RDX: 0000000000000003 RSI: 000000000000010d RDI: 0000000000000005
RBP: 00007ffa55632bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffa55816038 R14: 00007ffa55815fa0 R15: 00007ffebfb25ab8
</TASK>
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-....: (1 GPs behind) idle=cd24/1/0x4000000000000002 softirq=139616/139618 fqs=2100
(detected by 0, t=10505 jiffies, g=220285, q=710 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4036 Comm: syz.0.8521 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:irq_work_queue_on+0x13c/0x260 kernel/irq_work.c:-1
Code: 00 00 e8 a7 1d ca ff e8 d2 ee 9d 08 41 89 c7 89 ef 89 c6 e8 26 ab f3 ff 44 39 fd 75 16 e8 bc a9 f3 ff 48 89 df e8 34 fd ff ff <eb> 37 e8 ad a9 f3 ff eb 53 65 44 8b 3d cb a3 73 7e 44 89 fe 81 e6
RSP: 0018:ffffc900001e0608 EFLAGS: 00000046
RAX: 1ffffffff18c9f6a RBX: ffff8880b8f3b9f0 RCX: ffffffff8c64fb50
RDX: 0000000000000000 RSI: 00000000000000f6 RDI: 000000000000083f
RBP: 0000000000000001 R08: ffffc900001e0567 R09: 1ffff9200003c0ac
R10: dffffc0000000000 R11: fffff5200003c0ad R12: 0000000000000000
R13: dffffc0000000001 R14: 0000000000000000 R15: 0000000000000001
FS: 00007ffa565016c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f614f1e6158 CR3: 0000000081caa000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000200000000300
DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
<IRQ>
rcu_read_unlock_special+0x3c9/0x510 kernel/rcu/tree_plugin.h:678
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
rcu_read_unlock include/linux/rcupdate.h:823 [inline]
trace_call_bpf+0x5bb/0x6b0 kernel/trace/bpf_trace.c:137
perf_trace_run_bpf_submit+0x79/0x1c0 kernel/events/core.c:9997
perf_trace_preemptirq_template+0x268/0x320 include/trace/events/preemptirq.h:14
trace_irq_enable_rcuidle+0xd3/0x140 include/trace/events/preemptirq.h:40
trace_hardirqs_on+0x24/0x40 kernel/trace/trace_preemptirq.c:44
asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:rcu_read_unlock_special+0x7f/0x510 kernel/rcu/tree_plugin.h:685
Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 92 31 95 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc900001e0aa0 EFLAGS: 00000206
RAX: 5b7b902b26d45600 RBX: 1ffff9200003c15c RCX: 5b7b902b26d45600
RDX: dffffc0000000000 RSI: ffffffff8a8c1220 RDI: ffffffff8adf0de0
RBP: ffffc900001e0b90 R08: ffffffff90af5247 R09: 1ffffffff215ea48
R10: dffffc0000000000 R11: fffffbfff215ea49 R12: 0000000000000246
R13: dffffc0000000000 R14: ffff8880b8f3b900 R15: 0000000000000002
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
rcu_read_unlock include/linux/rcupdate.h:823 [inline]
ieee80211_iterate_active_interfaces_atomic+0x156/0x170 net/mac80211/util.c:826
mac80211_hwsim_beacon+0xb7/0x1b0 drivers/net/wireless/mac80211_hwsim.c:2147
__run_hrtimer kernel/time/hrtimer.c:1747 [inline]
__hrtimer_run_queues+0x560/0xd70 kernel/time/hrtimer.c:1811
hrtimer_run_softirq+0x183/0x2a0 kernel/time/hrtimer.c:1828
handle_softirqs+0x2a1/0x930 kernel/softirq.c:596
__do_softirq kernel/softirq.c:630 [inline]
invoke_softirq kernel/softirq.c:470 [inline]
__irq_exit_rcu+0x13b/0x230 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:console_emit_next_record+0x970/0xba0 kernel/printk/printk.c:2786
Code: 0f 85 a7 00 00 00 e8 8f a9 1a 00 0f b6 5c 24 0f 4d 85 e4 75 07 e8 80 a9 1a 00 eb 06 e8 79 a9 1a 00 fb 66 43 c7 44 3d 24 f8 f8 <43> c6 44 3d 26 f8 49 81 c6 00 06 06 06 4f 89 74 3d 14 66 43 c7 44
RSP: 0018:ffffc9000d387920 EFLAGS: 00000287
RAX: ffffffff8167cba7 RBX: 0000000000000001 RCX: 0000000000080000
RDX: ffffc90020a02000 RSI: 0000000000001c69 RDI: 0000000000001c6a
RBP: ffffc9000d387b40 R08: ffffffff90af5247 R09: 1ffffffff215ea48
R10: dffffc0000000000 R11: fffffbfff215ea49 R12: 0000000000000200
R13: 1ffff92001a70f30 R14: f8f8f8f8f2f2f2f8 R15: dffffc0000000000
console_flush_all kernel/printk/printk.c:-1 [inline]
console_unlock+0x223/0x630 kernel/printk/printk.c:2906
vprintk_emit+0x4b3/0x6a0 kernel/printk/printk.c:2303
_printk+0xda/0x130 kernel/printk/printk.c:2328
do_dccp_setsockopt net/dccp/proto.c:-1 [inline]
dccp_setsockopt+0x5b7/0x840 net/dccp/proto.c:579
__sys_setsockopt+0x2bf/0x3d0 net/socket.c:2287
__do_sys_setsockopt net/socket.c:2298 [inline]
__se_sys_setsockopt net/socket.c:2295 [inline]
__x64_sys_setsockopt+0xb1/0xc0 net/socket.c:2295
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7ffa5559c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffa56501028 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007ffa55815fa0 RCX: 00007ffa5559c799
RDX: 0000000000000003 RSI: 000000000000010d RDI: 0000000000000005
RBP: 00007ffa55632bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffa55816038 R14: 00007ffa55815fa0 R15: 00007ffebfb25ab8
</TASK>
rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 10601 jiffies s: 204769 root: 0x2/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4036 Comm: syz.0.8521 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:check_kcov_mode kernel/kcov.c:182 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x2a/0x60 kernel/kcov.c:216
Code: 48 8b 04 24 65 48 8b 0d 14 fa 7f 7e 65 8b 15 15 fa 7f 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 1c 16 00 00 00 <74> 2c 8b 91 f8 15 00 00 83 fa 02 75 21 48 8b 91 00 16 00 00 48 8b
RSP: 0018:ffffc900001e05d0 EFLAGS: 00000046
RAX: ffffffff818ec956 RBX: ffff8880b8f3b9f0 RCX: ffff88802b490000
RDX: 0000000000000100 RSI: 0000000000000001 RDI: 0000000000000002
RBP: 0000000000000001 R08: ffffc900001e0567 R09: 1ffff9200003c0ac
R10: dffffc0000000000 R11: fffff5200003c0ad R12: 0000000000000000
R13: dffffc0000000001 R14: ffffffff8c64f988 R15: dffffc0000000000
FS: 00007ffa565016c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f614f1e6158 CR3: 0000000081caa000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000200000000300
DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
<IRQ>
__irq_work_queue_local+0xb6/0x190 kernel/irq_work.c:97
irq_work_queue_on+0x13c/0x260 kernel/irq_work.c:165
rcu_read_unlock_special+0x3c9/0x510 kernel/rcu/tree_plugin.h:678
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
rcu_read_unlock include/linux/rcupdate.h:823 [inline]
trace_call_bpf+0x5bb/0x6b0 kernel/trace/bpf_trace.c:137
perf_trace_run_bpf_submit+0x79/0x1c0 kernel/events/core.c:9997
perf_trace_preemptirq_template+0x268/0x320 include/trace/events/preemptirq.h:14
trace_irq_enable_rcuidle+0xd3/0x140 include/trace/events/preemptirq.h:40
trace_hardirqs_on+0x24/0x40 kernel/trace/trace_preemptirq.c:44
asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:rcu_read_unlock_special+0x7f/0x510 kernel/rcu/tree_plugin.h:685
Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 92 31 95 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc900001e0aa0 EFLAGS: 00000206
RAX: 5b7b902b26d45600 RBX: 1ffff9200003c15c RCX: 5b7b902b26d45600
RDX: dffffc0000000000 RSI: ffffffff8a8c1220 RDI: ffffffff8adf0de0
RBP: ffffc900001e0b90 R08: ffffffff90af5247 R09: 1ffffffff215ea48
R10: dffffc0000000000 R11: fffffbfff215ea49 R12: 0000000000000246
R13: dffffc0000000000 R14: ffff8880b8f3b900 R15: 0000000000000002
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
rcu_read_unlock include/linux/rcupdate.h:823 [inline]
ieee80211_iterate_active_interfaces_atomic+0x156/0x170 net/mac80211/util.c:826
mac80211_hwsim_beacon+0xb7/0x1b0 drivers/net/wireless/mac80211_hwsim.c:2147
__run_hrtimer kernel/time/hrtimer.c:1747 [inline]
__hrtimer_run_queues+0x560/0xd70 kernel/time/hrtimer.c:1811
hrtimer_run_softirq+0x183/0x2a0 kernel/time/hrtimer.c:1828
handle_softirqs+0x2a1/0x930 kernel/softirq.c:596
__do_softirq kernel/softirq.c:630 [inline]
invoke_softirq kernel/softirq.c:470 [inline]
__irq_exit_rcu+0x13b/0x230 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:console_emit_next_record+0x970/0xba0 kernel/printk/printk.c:2786
Code: 0f 85 a7 00 00 00 e8 8f a9 1a 00 0f b6 5c 24 0f 4d 85 e4 75 07 e8 80 a9 1a 00 eb 06 e8 79 a9 1a 00 fb 66 43 c7 44 3d 24 f8 f8 <43> c6 44 3d 26 f8 49 81 c6 00 06 06 06 4f 89 74 3d 14 66 43 c7 44
RSP: 0018:ffffc9000d387920 EFLAGS: 00000287
RAX: ffffffff8167cba7 RBX: 0000000000000001 RCX: 0000000000080000
RDX: ffffc90020a02000 RSI: 0000000000001c69 RDI: 0000000000001c6a
RBP: ffffc9000d387b40 R08: ffffffff90af5247 R09: 1ffffffff215ea48
R10: dffffc0000000000 R11: fffffbfff215ea49 R12: 0000000000000200
R13: 1ffff92001a70f30 R14: f8f8f8f8f2f2f2f8 R15: dffffc0000000000
console_flush_all kernel/printk/printk.c:-1 [inline]
console_unlock+0x223/0x630 kernel/printk/printk.c:2906
vprintk_emit+0x4b3/0x6a0 kernel/printk/printk.c:2303
_printk+0xda/0x130 kernel/printk/printk.c:2328
do_dccp_setsockopt net/dccp/proto.c:-1 [inline]
dccp_setsockopt+0x5b7/0x840 net/dccp/proto.c:579
__sys_setsockopt+0x2bf/0x3d0 net/socket.c:2287
__do_sys_setsockopt net/socket.c:2298 [inline]
__se_sys_setsockopt net/socket.c:2295 [inline]
__x64_sys_setsockopt+0xb1/0xc0 net/socket.c:2295
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7ffa5559c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffa56501028 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007ffa55815fa0 RCX: 00007ffa5559c799
RDX: 0000000000000003 RSI: 000000000000010d RDI: 0000000000000005
RBP: 00007ffa55632bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffa55816038 R14: 00007ffa55815fa0 R15: 00007ffebfb25ab8
</TASK>
NMI backtrace for cpu 1
CPU: 1 PID: 4036 Comm: syz.0.8521 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:lock_release+0x1d/0x920 kernel/locking/lockdep.c:5670
Code: 00 00 00 e9 e4 f8 ff ff 0f 1f 44 00 00 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 81 ec e0 00 00 00 48 89 74 24 30 <48> 89 7c 24 10 65 48 8b 04 25 28 00 00 00 48 89 84 24 c0 00 00 00
RSP: 0018:ffffc900001e0480 EFLAGS: 00000082
RAX: ffffffff813a10fe RBX: 0000000000000001 RCX: ffff88802b490000
RDX: 0000000000000100 RSI: ffffffff813a0eb8 RDI: ffffffff8cb2d6e0
RBP: ffffc900001e0590 R08: dffffc0000000000 R09: 1ffffffff215ea48
R10: dffffc0000000000 R11: fffffbfff215ea49 R12: dffffc0000000000
R13: 0000000000000008 R14: ffffffff813a0eb8 R15: ffff88813fff92e0
FS: 00007ffa565016c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f614f1e6158 CR3: 0000000081caa000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000200000000300
DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
<IRQ>
rcu_lock_release include/linux/rcupdate.h:355 [inline]
rcu_read_unlock_sched include/linux/rcupdate.h:904 [inline]
pfn_valid include/linux/mmzone.h:1867 [inline]
__virt_addr_valid+0x435/0x540 arch/x86/mm/physaddr.c:65
kasan_addr_to_slab+0x9/0xc0 mm/kasan/common.c:36
__kasan_record_aux_stack+0xf/0xc0 mm/kasan/generic.c:471
irq_work_queue_on+0x10f/0x260 kernel/irq_work.c:140
rcu_read_unlock_special+0x3c9/0x510 kernel/rcu/tree_plugin.h:678
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
rcu_read_unlock include/linux/rcupdate.h:823 [inline]
trace_call_bpf+0x5bb/0x6b0 kernel/trace/bpf_trace.c:137
perf_trace_run_bpf_submit+0x79/0x1c0 kernel/events/core.c:9997
perf_trace_preemptirq_template+0x268/0x320 include/trace/events/preemptirq.h:14
trace_irq_enable_rcuidle+0xd3/0x140 include/trace/events/preemptirq.h:40
trace_hardirqs_on+0x24/0x40 kernel/trace/trace_preemptirq.c:44
asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:rcu_read_unlock_special+0x7f/0x510 kernel/rcu/tree_plugin.h:685
Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 92 31 95 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc900001e0aa0 EFLAGS: 00000206
RAX: 5b7b902b26d45600 RBX: 1ffff9200003c15c RCX: 5b7b902b26d45600
RDX: dffffc0000000000 RSI: ffffffff8a8c1220 RDI: ffffffff8adf0de0
RBP: ffffc900001e0b90 R08: ffffffff90af5247 R09: 1ffffffff215ea48
R10: dffffc0000000000 R11: fffffbfff215ea49 R12: 0000000000000246
R13: dffffc0000000000 R14: ffff8880b8f3b900 R15: 0000000000000002
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
rcu_read_unlock include/linux/rcupdate.h:823 [inline]
ieee80211_iterate_active_interfaces_atomic+0x156/0x170 net/mac80211/util.c:826
mac80211_hwsim_beacon+0xb7/0x1b0 drivers/net/wireless/mac80211_hwsim.c:2147
__run_hrtimer kernel/time/hrtimer.c:1747 [inline]
__hrtimer_run_queues+0x560/0xd70 kernel/time/hrtimer.c:1811
hrtimer_run_softirq+0x183/0x2a0 kernel/time/hrtimer.c:1828
handle_softirqs+0x2a1/0x930 kernel/softirq.c:596
__do_softirq kernel/softirq.c:630 [inline]
invoke_softirq kernel/softirq.c:470 [inline]
__irq_exit_rcu+0x13b/0x230 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:console_emit_next_record+0x970/0xba0 kernel/printk/printk.c:2786
Code: 0f 85 a7 00 00 00 e8 8f a9 1a 00 0f b6 5c 24 0f 4d 85 e4 75 07 e8 80 a9 1a 00 eb 06 e8 79 a9 1a 00 fb 66 43 c7 44 3d 24 f8 f8 <43> c6 44 3d 26 f8 49 81 c6 00 06 06 06 4f 89 74 3d 14 66 43 c7 44
RSP: 0018:ffffc9000d387920 EFLAGS: 00000287
RAX: ffffffff8167cba7 RBX: 0000000000000001 RCX: 0000000000080000
RDX: ffffc90020a02000 RSI: 0000000000001c69 RDI: 0000000000001c6a
RBP: ffffc9000d387b40 R08: ffffffff90af5247 R09: 1ffffffff215ea48
R10: dffffc0000000000 R11: fffffbfff215ea49 R12: 0000000000000200
R13: 1ffff92001a70f30 R14: f8f8f8f8f2f2f2f8 R15: dffffc0000000000
console_flush_all kernel/printk/printk.c:-1 [inline]
console_unlock+0x223/0x630 kernel/printk/printk.c:2906
vprintk_emit+0x4b3/0x6a0 kernel/printk/printk.c:2303
_printk+0xda/0x130 kernel/printk/printk.c:2328
do_dccp_setsockopt net/dccp/proto.c:-1 [inline]
dccp_setsockopt+0x5b7/0x840 net/dccp/proto.c:579
__sys_setsockopt+0x2bf/0x3d0 net/socket.c:2287
__do_sys_setsockopt net/socket.c:2298 [inline]
__se_sys_setsockopt net/socket.c:2295 [inline]
__x64_sys_setsockopt+0xb1/0xc0 net/socket.c:2295
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7ffa5559c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffa56501028 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007ffa55815fa0 RCX: 00007ffa5559c799
RDX: 0000000000000003 RSI: 000000000000010d RDI: 0000000000000005
RBP: 00007ffa55632bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffa55816038 R14: 00007ffa55815fa0 R15: 00007ffebfb25ab8
</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.
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If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: 779f9571ac3e Linux 6.1.164
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=106d30ba580000
kernel config: https://syzkaller.appspot.com/x/.config?x=f0605c5af04d7603
dashboard link: https://syzkaller.appspot.com/bug?extid=11e6e26fa369d98f5a71
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/d8bc7a0c33a8/disk-779f9571.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/870b0bf266c7/vmlinux-779f9571.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ce1e3301c41d/bzImage-779f9571.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+11e6e2...@syzkaller.appspotmail.com
rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 2666 jiffies s: 204769 root: 0x2/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4036 Comm: syz.0.8521 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:rcu_dynticks_curr_cpu_in_eqs include/linux/context_tracking.h:122 [inline]
RIP: 0010:ct_nmi_exit+0x59/0x1c0 kernel/context_tracking.c:215
Code: 65 48 8b 05 61 a8 d6 75 48 85 c0 0f 8e 19 01 00 00 e8 5b 0a 00 00 41 89 c6 83 f8 08 0f 83 2a 01 00 00 4a 8b 04 f5 80 f9 64 8c <f7> 80 08 58 03 00 04 00 00 00 0f 84 f7 00 00 00 48 c7 c7 40 df 94
RSP: 0018:ffffc900001e08e8 EFLAGS: 00000097
RAX: ffff8880b8f00000 RBX: ffff8880b8f35800 RCX: 5b7b902b26d45600
RDX: 0000000000000100 RSI: ffffffff8adf0dc0 RDI: ffffffff8adf0d80
RBP: ffffc900001e09a8 R08: ffffffff8e1fcd2f R09: 1ffffffff1c3f9a5
R10: dffffc0000000000 R11: fffffbfff1c3f9a6 R12: dffffc0000000000
R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000000
FS: 00007ffa565016c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f614f1e6158 CR3: 0000000081caa000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000200000000300
DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
<IRQ>
ct_irq_exit_irqson+0xaf/0x170 kernel/context_tracking.c:422
trace_irq_enable_rcuidle+0xd8/0x140 include/trace/events/preemptirq.h:40
trace_hardirqs_on+0x24/0x40 kernel/trace/trace_preemptirq.c:44
asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:rcu_read_unlock_special+0x7f/0x510 kernel/rcu/tree_plugin.h:685
Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 92 31 95 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc900001e0aa0 EFLAGS: 00000206
RAX: 5b7b902b26d45600 RBX: 1ffff9200003c15c RCX: 5b7b902b26d45600
RDX: dffffc0000000000 RSI: ffffffff8a8c1220 RDI: ffffffff8adf0de0
RBP: ffffc900001e0b90 R08: ffffffff90af5247 R09: 1ffffffff215ea48
R10: dffffc0000000000 R11: fffffbfff215ea49 R12: 0000000000000246
R13: dffffc0000000000 R14: ffff8880b8f3b900 R15: 0000000000000002
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
rcu_read_unlock include/linux/rcupdate.h:823 [inline]
ieee80211_iterate_active_interfaces_atomic+0x156/0x170 net/mac80211/util.c:826
mac80211_hwsim_beacon+0xb7/0x1b0 drivers/net/wireless/mac80211_hwsim.c:2147
__run_hrtimer kernel/time/hrtimer.c:1747 [inline]
__hrtimer_run_queues+0x560/0xd70 kernel/time/hrtimer.c:1811
hrtimer_run_softirq+0x183/0x2a0 kernel/time/hrtimer.c:1828
handle_softirqs+0x2a1/0x930 kernel/softirq.c:596
__do_softirq kernel/softirq.c:630 [inline]
invoke_softirq kernel/softirq.c:470 [inline]
__irq_exit_rcu+0x13b/0x230 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:console_emit_next_record+0x970/0xba0 kernel/printk/printk.c:2786
Code: 0f 85 a7 00 00 00 e8 8f a9 1a 00 0f b6 5c 24 0f 4d 85 e4 75 07 e8 80 a9 1a 00 eb 06 e8 79 a9 1a 00 fb 66 43 c7 44 3d 24 f8 f8 <43> c6 44 3d 26 f8 49 81 c6 00 06 06 06 4f 89 74 3d 14 66 43 c7 44
RSP: 0018:ffffc9000d387920 EFLAGS: 00000287
RAX: ffffffff8167cba7 RBX: 0000000000000001 RCX: 0000000000080000
RDX: ffffc90020a02000 RSI: 0000000000001c69 RDI: 0000000000001c6a
RBP: ffffc9000d387b40 R08: ffffffff90af5247 R09: 1ffffffff215ea48
R10: dffffc0000000000 R11: fffffbfff215ea49 R12: 0000000000000200
R13: 1ffff92001a70f30 R14: f8f8f8f8f2f2f2f8 R15: dffffc0000000000
console_flush_all kernel/printk/printk.c:-1 [inline]
console_unlock+0x223/0x630 kernel/printk/printk.c:2906
vprintk_emit+0x4b3/0x6a0 kernel/printk/printk.c:2303
_printk+0xda/0x130 kernel/printk/printk.c:2328
do_dccp_setsockopt net/dccp/proto.c:-1 [inline]
dccp_setsockopt+0x5b7/0x840 net/dccp/proto.c:579
__sys_setsockopt+0x2bf/0x3d0 net/socket.c:2287
__do_sys_setsockopt net/socket.c:2298 [inline]
__se_sys_setsockopt net/socket.c:2295 [inline]
__x64_sys_setsockopt+0xb1/0xc0 net/socket.c:2295
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7ffa5559c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffa56501028 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007ffa55815fa0 RCX: 00007ffa5559c799
RDX: 0000000000000003 RSI: 000000000000010d RDI: 0000000000000005
RBP: 00007ffa55632bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffa55816038 R14: 00007ffa55815fa0 R15: 00007ffebfb25ab8
</TASK>
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-....: (1 GPs behind) idle=cd24/1/0x4000000000000002 softirq=139616/139618 fqs=2100
(detected by 0, t=10505 jiffies, g=220285, q=710 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4036 Comm: syz.0.8521 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:irq_work_queue_on+0x13c/0x260 kernel/irq_work.c:-1
Code: 00 00 e8 a7 1d ca ff e8 d2 ee 9d 08 41 89 c7 89 ef 89 c6 e8 26 ab f3 ff 44 39 fd 75 16 e8 bc a9 f3 ff 48 89 df e8 34 fd ff ff <eb> 37 e8 ad a9 f3 ff eb 53 65 44 8b 3d cb a3 73 7e 44 89 fe 81 e6
RSP: 0018:ffffc900001e0608 EFLAGS: 00000046
RAX: 1ffffffff18c9f6a RBX: ffff8880b8f3b9f0 RCX: ffffffff8c64fb50
RDX: 0000000000000000 RSI: 00000000000000f6 RDI: 000000000000083f
RBP: 0000000000000001 R08: ffffc900001e0567 R09: 1ffff9200003c0ac
R10: dffffc0000000000 R11: fffff5200003c0ad R12: 0000000000000000
R13: dffffc0000000001 R14: 0000000000000000 R15: 0000000000000001
FS: 00007ffa565016c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f614f1e6158 CR3: 0000000081caa000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000200000000300
DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
<IRQ>
rcu_read_unlock_special+0x3c9/0x510 kernel/rcu/tree_plugin.h:678
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
rcu_read_unlock include/linux/rcupdate.h:823 [inline]
trace_call_bpf+0x5bb/0x6b0 kernel/trace/bpf_trace.c:137
perf_trace_run_bpf_submit+0x79/0x1c0 kernel/events/core.c:9997
perf_trace_preemptirq_template+0x268/0x320 include/trace/events/preemptirq.h:14
trace_irq_enable_rcuidle+0xd3/0x140 include/trace/events/preemptirq.h:40
trace_hardirqs_on+0x24/0x40 kernel/trace/trace_preemptirq.c:44
asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:rcu_read_unlock_special+0x7f/0x510 kernel/rcu/tree_plugin.h:685
Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 92 31 95 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc900001e0aa0 EFLAGS: 00000206
RAX: 5b7b902b26d45600 RBX: 1ffff9200003c15c RCX: 5b7b902b26d45600
RDX: dffffc0000000000 RSI: ffffffff8a8c1220 RDI: ffffffff8adf0de0
RBP: ffffc900001e0b90 R08: ffffffff90af5247 R09: 1ffffffff215ea48
R10: dffffc0000000000 R11: fffffbfff215ea49 R12: 0000000000000246
R13: dffffc0000000000 R14: ffff8880b8f3b900 R15: 0000000000000002
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
rcu_read_unlock include/linux/rcupdate.h:823 [inline]
ieee80211_iterate_active_interfaces_atomic+0x156/0x170 net/mac80211/util.c:826
mac80211_hwsim_beacon+0xb7/0x1b0 drivers/net/wireless/mac80211_hwsim.c:2147
__run_hrtimer kernel/time/hrtimer.c:1747 [inline]
__hrtimer_run_queues+0x560/0xd70 kernel/time/hrtimer.c:1811
hrtimer_run_softirq+0x183/0x2a0 kernel/time/hrtimer.c:1828
handle_softirqs+0x2a1/0x930 kernel/softirq.c:596
__do_softirq kernel/softirq.c:630 [inline]
invoke_softirq kernel/softirq.c:470 [inline]
__irq_exit_rcu+0x13b/0x230 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:console_emit_next_record+0x970/0xba0 kernel/printk/printk.c:2786
Code: 0f 85 a7 00 00 00 e8 8f a9 1a 00 0f b6 5c 24 0f 4d 85 e4 75 07 e8 80 a9 1a 00 eb 06 e8 79 a9 1a 00 fb 66 43 c7 44 3d 24 f8 f8 <43> c6 44 3d 26 f8 49 81 c6 00 06 06 06 4f 89 74 3d 14 66 43 c7 44
RSP: 0018:ffffc9000d387920 EFLAGS: 00000287
RAX: ffffffff8167cba7 RBX: 0000000000000001 RCX: 0000000000080000
RDX: ffffc90020a02000 RSI: 0000000000001c69 RDI: 0000000000001c6a
RBP: ffffc9000d387b40 R08: ffffffff90af5247 R09: 1ffffffff215ea48
R10: dffffc0000000000 R11: fffffbfff215ea49 R12: 0000000000000200
R13: 1ffff92001a70f30 R14: f8f8f8f8f2f2f2f8 R15: dffffc0000000000
console_flush_all kernel/printk/printk.c:-1 [inline]
console_unlock+0x223/0x630 kernel/printk/printk.c:2906
vprintk_emit+0x4b3/0x6a0 kernel/printk/printk.c:2303
_printk+0xda/0x130 kernel/printk/printk.c:2328
do_dccp_setsockopt net/dccp/proto.c:-1 [inline]
dccp_setsockopt+0x5b7/0x840 net/dccp/proto.c:579
__sys_setsockopt+0x2bf/0x3d0 net/socket.c:2287
__do_sys_setsockopt net/socket.c:2298 [inline]
__se_sys_setsockopt net/socket.c:2295 [inline]
__x64_sys_setsockopt+0xb1/0xc0 net/socket.c:2295
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7ffa5559c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffa56501028 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007ffa55815fa0 RCX: 00007ffa5559c799
RDX: 0000000000000003 RSI: 000000000000010d RDI: 0000000000000005
RBP: 00007ffa55632bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffa55816038 R14: 00007ffa55815fa0 R15: 00007ffebfb25ab8
</TASK>
rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 10601 jiffies s: 204769 root: 0x2/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4036 Comm: syz.0.8521 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:check_kcov_mode kernel/kcov.c:182 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x2a/0x60 kernel/kcov.c:216
Code: 48 8b 04 24 65 48 8b 0d 14 fa 7f 7e 65 8b 15 15 fa 7f 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 1c 16 00 00 00 <74> 2c 8b 91 f8 15 00 00 83 fa 02 75 21 48 8b 91 00 16 00 00 48 8b
RSP: 0018:ffffc900001e05d0 EFLAGS: 00000046
RAX: ffffffff818ec956 RBX: ffff8880b8f3b9f0 RCX: ffff88802b490000
RDX: 0000000000000100 RSI: 0000000000000001 RDI: 0000000000000002
RBP: 0000000000000001 R08: ffffc900001e0567 R09: 1ffff9200003c0ac
R10: dffffc0000000000 R11: fffff5200003c0ad R12: 0000000000000000
R13: dffffc0000000001 R14: ffffffff8c64f988 R15: dffffc0000000000
FS: 00007ffa565016c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f614f1e6158 CR3: 0000000081caa000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000200000000300
DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
<IRQ>
__irq_work_queue_local+0xb6/0x190 kernel/irq_work.c:97
irq_work_queue_on+0x13c/0x260 kernel/irq_work.c:165
rcu_read_unlock_special+0x3c9/0x510 kernel/rcu/tree_plugin.h:678
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
rcu_read_unlock include/linux/rcupdate.h:823 [inline]
trace_call_bpf+0x5bb/0x6b0 kernel/trace/bpf_trace.c:137
perf_trace_run_bpf_submit+0x79/0x1c0 kernel/events/core.c:9997
perf_trace_preemptirq_template+0x268/0x320 include/trace/events/preemptirq.h:14
trace_irq_enable_rcuidle+0xd3/0x140 include/trace/events/preemptirq.h:40
trace_hardirqs_on+0x24/0x40 kernel/trace/trace_preemptirq.c:44
asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:rcu_read_unlock_special+0x7f/0x510 kernel/rcu/tree_plugin.h:685
Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 92 31 95 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc900001e0aa0 EFLAGS: 00000206
RAX: 5b7b902b26d45600 RBX: 1ffff9200003c15c RCX: 5b7b902b26d45600
RDX: dffffc0000000000 RSI: ffffffff8a8c1220 RDI: ffffffff8adf0de0
RBP: ffffc900001e0b90 R08: ffffffff90af5247 R09: 1ffffffff215ea48
R10: dffffc0000000000 R11: fffffbfff215ea49 R12: 0000000000000246
R13: dffffc0000000000 R14: ffff8880b8f3b900 R15: 0000000000000002
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
rcu_read_unlock include/linux/rcupdate.h:823 [inline]
ieee80211_iterate_active_interfaces_atomic+0x156/0x170 net/mac80211/util.c:826
mac80211_hwsim_beacon+0xb7/0x1b0 drivers/net/wireless/mac80211_hwsim.c:2147
__run_hrtimer kernel/time/hrtimer.c:1747 [inline]
__hrtimer_run_queues+0x560/0xd70 kernel/time/hrtimer.c:1811
hrtimer_run_softirq+0x183/0x2a0 kernel/time/hrtimer.c:1828
handle_softirqs+0x2a1/0x930 kernel/softirq.c:596
__do_softirq kernel/softirq.c:630 [inline]
invoke_softirq kernel/softirq.c:470 [inline]
__irq_exit_rcu+0x13b/0x230 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:console_emit_next_record+0x970/0xba0 kernel/printk/printk.c:2786
Code: 0f 85 a7 00 00 00 e8 8f a9 1a 00 0f b6 5c 24 0f 4d 85 e4 75 07 e8 80 a9 1a 00 eb 06 e8 79 a9 1a 00 fb 66 43 c7 44 3d 24 f8 f8 <43> c6 44 3d 26 f8 49 81 c6 00 06 06 06 4f 89 74 3d 14 66 43 c7 44
RSP: 0018:ffffc9000d387920 EFLAGS: 00000287
RAX: ffffffff8167cba7 RBX: 0000000000000001 RCX: 0000000000080000
RDX: ffffc90020a02000 RSI: 0000000000001c69 RDI: 0000000000001c6a
RBP: ffffc9000d387b40 R08: ffffffff90af5247 R09: 1ffffffff215ea48
R10: dffffc0000000000 R11: fffffbfff215ea49 R12: 0000000000000200
R13: 1ffff92001a70f30 R14: f8f8f8f8f2f2f2f8 R15: dffffc0000000000
console_flush_all kernel/printk/printk.c:-1 [inline]
console_unlock+0x223/0x630 kernel/printk/printk.c:2906
vprintk_emit+0x4b3/0x6a0 kernel/printk/printk.c:2303
_printk+0xda/0x130 kernel/printk/printk.c:2328
do_dccp_setsockopt net/dccp/proto.c:-1 [inline]
dccp_setsockopt+0x5b7/0x840 net/dccp/proto.c:579
__sys_setsockopt+0x2bf/0x3d0 net/socket.c:2287
__do_sys_setsockopt net/socket.c:2298 [inline]
__se_sys_setsockopt net/socket.c:2295 [inline]
__x64_sys_setsockopt+0xb1/0xc0 net/socket.c:2295
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7ffa5559c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffa56501028 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007ffa55815fa0 RCX: 00007ffa5559c799
RDX: 0000000000000003 RSI: 000000000000010d RDI: 0000000000000005
RBP: 00007ffa55632bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffa55816038 R14: 00007ffa55815fa0 R15: 00007ffebfb25ab8
</TASK>
NMI backtrace for cpu 1
CPU: 1 PID: 4036 Comm: syz.0.8521 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:lock_release+0x1d/0x920 kernel/locking/lockdep.c:5670
Code: 00 00 00 e9 e4 f8 ff ff 0f 1f 44 00 00 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 81 ec e0 00 00 00 48 89 74 24 30 <48> 89 7c 24 10 65 48 8b 04 25 28 00 00 00 48 89 84 24 c0 00 00 00
RSP: 0018:ffffc900001e0480 EFLAGS: 00000082
RAX: ffffffff813a10fe RBX: 0000000000000001 RCX: ffff88802b490000
RDX: 0000000000000100 RSI: ffffffff813a0eb8 RDI: ffffffff8cb2d6e0
RBP: ffffc900001e0590 R08: dffffc0000000000 R09: 1ffffffff215ea48
R10: dffffc0000000000 R11: fffffbfff215ea49 R12: dffffc0000000000
R13: 0000000000000008 R14: ffffffff813a0eb8 R15: ffff88813fff92e0
FS: 00007ffa565016c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f614f1e6158 CR3: 0000000081caa000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000200000000300
DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
<IRQ>
rcu_lock_release include/linux/rcupdate.h:355 [inline]
rcu_read_unlock_sched include/linux/rcupdate.h:904 [inline]
pfn_valid include/linux/mmzone.h:1867 [inline]
__virt_addr_valid+0x435/0x540 arch/x86/mm/physaddr.c:65
kasan_addr_to_slab+0x9/0xc0 mm/kasan/common.c:36
__kasan_record_aux_stack+0xf/0xc0 mm/kasan/generic.c:471
irq_work_queue_on+0x10f/0x260 kernel/irq_work.c:140
rcu_read_unlock_special+0x3c9/0x510 kernel/rcu/tree_plugin.h:678
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
rcu_read_unlock include/linux/rcupdate.h:823 [inline]
trace_call_bpf+0x5bb/0x6b0 kernel/trace/bpf_trace.c:137
perf_trace_run_bpf_submit+0x79/0x1c0 kernel/events/core.c:9997
perf_trace_preemptirq_template+0x268/0x320 include/trace/events/preemptirq.h:14
trace_irq_enable_rcuidle+0xd3/0x140 include/trace/events/preemptirq.h:40
trace_hardirqs_on+0x24/0x40 kernel/trace/trace_preemptirq.c:44
asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:rcu_read_unlock_special+0x7f/0x510 kernel/rcu/tree_plugin.h:685
Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 92 31 95 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc900001e0aa0 EFLAGS: 00000206
RAX: 5b7b902b26d45600 RBX: 1ffff9200003c15c RCX: 5b7b902b26d45600
RDX: dffffc0000000000 RSI: ffffffff8a8c1220 RDI: ffffffff8adf0de0
RBP: ffffc900001e0b90 R08: ffffffff90af5247 R09: 1ffffffff215ea48
R10: dffffc0000000000 R11: fffffbfff215ea49 R12: 0000000000000246
R13: dffffc0000000000 R14: ffff8880b8f3b900 R15: 0000000000000002
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
rcu_read_unlock include/linux/rcupdate.h:823 [inline]
ieee80211_iterate_active_interfaces_atomic+0x156/0x170 net/mac80211/util.c:826
mac80211_hwsim_beacon+0xb7/0x1b0 drivers/net/wireless/mac80211_hwsim.c:2147
__run_hrtimer kernel/time/hrtimer.c:1747 [inline]
__hrtimer_run_queues+0x560/0xd70 kernel/time/hrtimer.c:1811
hrtimer_run_softirq+0x183/0x2a0 kernel/time/hrtimer.c:1828
handle_softirqs+0x2a1/0x930 kernel/softirq.c:596
__do_softirq kernel/softirq.c:630 [inline]
invoke_softirq kernel/softirq.c:470 [inline]
__irq_exit_rcu+0x13b/0x230 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:console_emit_next_record+0x970/0xba0 kernel/printk/printk.c:2786
Code: 0f 85 a7 00 00 00 e8 8f a9 1a 00 0f b6 5c 24 0f 4d 85 e4 75 07 e8 80 a9 1a 00 eb 06 e8 79 a9 1a 00 fb 66 43 c7 44 3d 24 f8 f8 <43> c6 44 3d 26 f8 49 81 c6 00 06 06 06 4f 89 74 3d 14 66 43 c7 44
RSP: 0018:ffffc9000d387920 EFLAGS: 00000287
RAX: ffffffff8167cba7 RBX: 0000000000000001 RCX: 0000000000080000
RDX: ffffc90020a02000 RSI: 0000000000001c69 RDI: 0000000000001c6a
RBP: ffffc9000d387b40 R08: ffffffff90af5247 R09: 1ffffffff215ea48
R10: dffffc0000000000 R11: fffffbfff215ea49 R12: 0000000000000200
R13: 1ffff92001a70f30 R14: f8f8f8f8f2f2f2f8 R15: dffffc0000000000
console_flush_all kernel/printk/printk.c:-1 [inline]
console_unlock+0x223/0x630 kernel/printk/printk.c:2906
vprintk_emit+0x4b3/0x6a0 kernel/printk/printk.c:2303
_printk+0xda/0x130 kernel/printk/printk.c:2328
do_dccp_setsockopt net/dccp/proto.c:-1 [inline]
dccp_setsockopt+0x5b7/0x840 net/dccp/proto.c:579
__sys_setsockopt+0x2bf/0x3d0 net/socket.c:2287
__do_sys_setsockopt net/socket.c:2298 [inline]
__se_sys_setsockopt net/socket.c:2295 [inline]
__x64_sys_setsockopt+0xb1/0xc0 net/socket.c:2295
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7ffa5559c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffa56501028 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007ffa55815fa0 RCX: 00007ffa5559c799
RDX: 0000000000000003 RSI: 000000000000010d RDI: 0000000000000005
RBP: 00007ffa55632bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffa55816038 R14: 00007ffa55815fa0 R15: 00007ffebfb25ab8
</TASK>
---
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