[v6.1] INFO: rcu detected stall in sys_clone (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: d7543167affd Linux 6.1.82
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=101a01f1180000
kernel config: https://syzkaller.appspot.com/x/.config?x=59059e181681c079
dashboard link: https://syzkaller.appspot.com/bug?extid=6554f4b40050f14e4b13
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/88220954516a/disk-d7543167.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c9062e074717/vmlinux-d7543167.xz
kernel image: https://storage.googleapis.com/syzbot-assets/70391b45a752/bzImage-d7543167.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6554f4...@syzkaller.appspotmail.com

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-...!: (1 GPs behind) idle=0a34/1/0x4000000000000000 softirq=112020/112022 fqs=128
(detected by 1, t=10502 jiffies, g=180265, q=315 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 28149 Comm: syz-executor.1 Not tainted 6.1.82-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
RIP: 0010:match_held_lock+0x0/0xb0 kernel/locking/lockdep.c:5107
Code: 4d 0a ea 03 00 75 cf 48 c7 c7 e0 ec eb 8a 48 c7 c6 20 ed eb 8a e8 d0 ee c8 f6 0f 0b eb b6 e8 e7 fa ff ff 0f 1f 80 00 00 00 00 <55> 53 bd 01 00 00 00 48 39 77 10 74 67 48 89 fb 81 7f 20 00 00 10
RSP: 0018:ffffc90000007d10 EFLAGS: 00000083
RAX: 0000000000000006 RBX: 0000000000000001 RCX: ffff888021e2bb80
RDX: ffff888021e2bb80 RSI: ffff8880b982a4d8 RDI: ffff888021e2c688
RBP: ffff888021e2c688 R08: ffffffff8179ae51 R09: ffff888020a4a340
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000046
R13: ffff888021e2bb80 R14: 00000000ffffffff R15: ffff8880b982a4d8
FS: 0000555556256480(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3d40bad988 CR3: 000000007dd4c000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<NMI>
</NMI>
<IRQ>
__lock_is_held kernel/locking/lockdep.c:5403 [inline]
lock_is_held_type+0xa4/0x180 kernel/locking/lockdep.c:5705
lock_is_held include/linux/lockdep.h:283 [inline]
__run_hrtimer kernel/time/hrtimer.c:1652 [inline]
__hrtimer_run_queues+0x307/0xe50 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+0x8c/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:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x4/0x60 kernel/kcov.c:206
Code: 00 0f 0b 0f 1f 00 53 48 89 fb e8 17 00 00 00 48 8b 3d 58 e1 e8 0c 48 89 de 5b e9 37 9e 56 00 cc cc cc cc cc cc cc 48 8b 04 24 <65> 48 8b 0d a4 eb 77 7e 65 8b 15 a5 eb 77 7e f7 c2 00 01 ff 00 74
RSP: 0018:ffffc90003def4b8 EFLAGS: 00000246
RAX: ffffffff81cbf3c0 RBX: 0000000000000000 RCX: ffff888021e2bb80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003def870 R08: ffffffff81cbf3a9 R09: fffff9400011a4e9
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888077e254e0
R13: 0000000000000000 R14: ffffea00008d2748 R15: 1ffffd400011a4e9
arch_static_branch arch/x86/include/asm/jump_label.h:27 [inline]
page_fixed_fake_head include/linux/page-flags.h:216 [inline]
_compound_head include/linux/page-flags.h:257 [inline]
PageAnon include/linux/page-flags.h:669 [inline]
copy_present_pte mm/memory.c:987 [inline]
copy_pte_range mm/memory.c:1091 [inline]
copy_pmd_range mm/memory.c:1177 [inline]
copy_pud_range mm/memory.c:1214 [inline]
copy_p4d_range mm/memory.c:1238 [inline]
copy_page_range+0x18d0/0x4660 mm/memory.c:1336
dup_mmap kernel/fork.c:696 [inline]
dup_mm kernel/fork.c:1540 [inline]
copy_mm+0xf42/0x1990 kernel/fork.c:1589
copy_process+0x19d5/0x4060 kernel/fork.c:2267
kernel_clone+0x222/0x920 kernel/fork.c:2682
__do_sys_clone kernel/fork.c:2823 [inline]
__se_sys_clone kernel/fork.c:2807 [inline]
__x64_sys_clone+0x231/0x280 kernel/fork.c:2807
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fbca427add3
Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00
RSP: 002b:00007ffd08ebd758 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbca427add3
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000555556256750 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000001
</TASK>
rcu: rcu_preempt kthread starved for 10246 jiffies! g180265 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
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:26680 pid:16 ppid:2 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x142d/0x4550 kernel/sched/core.c:6558
schedule+0xbf/0x180 kernel/sched/core.c:6634
schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1935
rcu_gp_fqs_loop+0x2d2/0x1120 kernel/rcu/tree.c:1706
rcu_gp_kthread+0xa3/0x3a0 kernel/rcu/tree.c:1905
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:307
</TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 PID: 1040 Comm: kworker/1:10 Not tainted 6.1.82-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
Workqueue: events once_deferred
RIP: 0010:csd_lock_wait kernel/smp.c:424 [inline]
RIP: 0010:smp_call_function_many_cond+0x1fb0/0x3460 kernel/smp.c:998
Code: 2f 44 89 ee 83 e6 01 31 ff e8 ec 42 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 0a e8 77 3f 0b 00 e9 1b ff ff ff f3 90 <42> 0f b6 04 2b 84 c0 75 14 41 f7 07 01 00 00 00 0f 84 fe fe ff ff
RSP: 0018:ffffc9000ae47680 EFLAGS: 00000293
RAX: ffffffff817f443b RBX: 1ffff1101730859d RCX: ffff888058a09dc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000ae47a60 R08: ffffffff817f4404 R09: fffffbfff2092c45
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000800000000
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8880b9842ce8
FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000040 CR3: 000000000ce8e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
</IRQ>
<TASK>
on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1166
on_each_cpu include/linux/smp.h:71 [inline]
text_poke_sync arch/x86/kernel/alternative.c:1334 [inline]
text_poke_bp_batch+0x2bb/0x940 arch/x86/kernel/alternative.c:1534
text_poke_flush arch/x86/kernel/alternative.c:1725 [inline]
text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1732
arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146
static_key_disable_cpuslocked+0xca/0x1b0 kernel/jump_label.c:207
static_key_disable+0x16/0x20 kernel/jump_label.c:215
once_deferred+0x6c/0xb0 lib/once.c:20
process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:307
</TASK>


---
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[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 9465fef4ae35 Linux 5.15.153
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=13b6edc9180000
kernel config: https://syzkaller.appspot.com/x/.config?x=176c746ee3348b33
dashboard link: https://syzkaller.appspot.com/bug?extid=a871499fe9cf68fa0d04

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/2962c02652ce/disk-9465fef4.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/d0f5a1ce082d/vmlinux-9465fef4.xz
kernel image: https://storage.googleapis.com/syzbot-assets/86b5b1eea636/bzImage-9465fef4.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:

Reported-by: syzbot+a87149...@syzkaller.appspotmail.com

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:

rcu: 1-...!: (1 GPs behind) idle=981/1/0x4000000000000000 softirq=34591/34592 fqs=1246
(detected by 0, t=10502 jiffies, g=46073, q=637)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 6906 Comm: syz-executor.2 Not tainted 5.15.153-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024

RIP: 0010:kasan_check_range+0x1/0x290 mm/kasan/generic.c:188
Code: 01 c6 48 89 c7 e8 6f a0 52 08 31 c0 c3 0f 0b b8 ea ff ff ff c3 0f 0b b8 ea ff ff ff c3 cc cc cc cc cc cc cc cc cc cc cc cc 55 <41> 57 41 56 53 b0 01 48 85 f6 0f 84 9a 01 00 00 48 89 fd 48 01 f5
RSP: 0018:ffffc90000dd0bd0 EFLAGS: 00000046
RAX: ffffffff8833eb4b RBX: 0000000000000001 RCX: ffffffff8833eb5d
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88801e066188
RBP: ffffc90000dd0cb0 R08: ffffffff886a92de R09: fffffbfff1f7a019
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88801e066000
R13: dffffc0000000000 R14: 1ffff920001ba180 R15: 17c4bcbfa0000000
FS: 00005555563bb480(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 0000000000000000 CR3: 0000000062194000 CR4: 00000000003506e0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:

<NMI>
</NMI>
<IRQ>
instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
test_and_set_bit include/asm-generic/bitops/instrumented-atomic.h:70 [inline]
__netif_schedule+0x8d/0x310 net/core/dev.c:3073
advance_sched+0x750/0x940 net/sched/sch_taprio.c:770
__run_hrtimer kernel/time/hrtimer.c:1686 [inline]
__hrtimer_run_queues+0x598/0xcf0 kernel/time/hrtimer.c:1750
hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1812
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline]
__sysvec_apic_timer_interrupt+0x139/0x470 arch/x86/kernel/apic/apic.c:1102
sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1096
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:get_page_from_freelist+0x0/0x33c0 mm/page_alloc.c:4045
Code: 89 e9 41 89 d8 e8 f0 38 f4 ff 65 ff 0d a1 b7 42 7e 0f 85 0f fc ff ff e8 46 cf 40 ff e9 05 fc ff ff 0f 0b e9 47 ff ff ff 66 90 <55> 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 81 ec 80 02
RSP: 0018:ffffc900032e7318 EFLAGS: 00000297
RAX: 0000000000000004 RBX: 0000000000000000 RCX: ffffc900032e7380
RDX: 0000000000000901 RSI: 0000000000000000 RDI: 0000000000500dc0
RBP: ffffc900032e7430 R08: dffffc0000000000 R09: ffffed100371d9d4
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000901
R13: 1ffff9200065ce6c R14: 1ffff9200065ce6e R15: 1ffff9200065ce68
__alloc_pages+0x272/0x700 mm/page_alloc.c:5421
__pte_alloc_one include/asm-generic/pgalloc.h:63 [inline]
pte_alloc_one+0x86/0x360 arch/x86/mm/pgtable.c:33
__pte_alloc+0x75/0x210 mm/memory.c:439
copy_pte_range mm/memory.c:1021 [inline]
copy_pmd_range mm/memory.c:1156 [inline]
copy_pud_range mm/memory.c:1193 [inline]
copy_p4d_range mm/memory.c:1217 [inline]
copy_page_range+0x37cc/0x43b0 mm/memory.c:1290
dup_mmap kernel/fork.c:614 [inline]
dup_mm kernel/fork.c:1465 [inline]
copy_mm+0xc64/0x1370 kernel/fork.c:1517
copy_process+0x1816/0x3ef0 kernel/fork.c:2206
kernel_clone+0x210/0x960 kernel/fork.c:2604
__do_sys_clone kernel/fork.c:2721 [inline]
__se_sys_clone kernel/fork.c:2705 [inline]
__x64_sys_clone+0x23f/0x290 kernel/fork.c:2705
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fbf5ab1edd3

Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00

RSP: 002b:00007ffe40176018 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbf5ab1edd3

RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000

R10: 00005555563bb750 R11: 0000000000000246 R12: 0000000000000000

R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000001
</TASK>

rcu: rcu_preempt kthread starved for 8008 jiffies! g46073 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:27000 pid: 15 ppid: 2 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5030 [inline]
__schedule+0x12c4/0x45b0 kernel/sched/core.c:6376
schedule+0x11b/0x1f0 kernel/sched/core.c:6459
schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1884
rcu_gp_fqs_loop+0x2bf/0x1080 kernel/rcu/tree.c:1972
rcu_gp_kthread+0xa4/0x360 kernel/rcu/tree.c:2145
kthread+0x3f6/0x4f0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

</TASK>
rcu: Stack dump where RCU GP kthread last ran:

NMI backtrace for cpu 0

CPU: 0 PID: 11011 Comm: syz-executor.1 Not tainted 5.15.153-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024

Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline]
rcu_check_gp_kthread_starvation+0x1d2/0x240 kernel/rcu/tree_stall.h:487
print_other_cpu_stall+0x137a/0x14d0 kernel/rcu/tree_stall.h:592
check_cpu_stall kernel/rcu/tree_stall.h:745 [inline]
rcu_pending kernel/rcu/tree.c:3932 [inline]
rcu_sched_clock_irq+0xa38/0x1150 kernel/rcu/tree.c:2619
update_process_times+0x196/0x200 kernel/time/timer.c:1788
tick_sched_handle kernel/time/tick-sched.c:254 [inline]
tick_sched_timer+0x386/0x550 kernel/time/tick-sched.c:1473
__run_hrtimer kernel/time/hrtimer.c:1686 [inline]
__hrtimer_run_queues+0x55b/0xcf0 kernel/time/hrtimer.c:1750
hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1812
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline]
__sysvec_apic_timer_interrupt+0x139/0x470 arch/x86/kernel/apic/apic.c:1102
sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1096
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:csd_lock_wait kernel/smp.c:440 [inline]
RIP: 0010:smp_call_function_many_cond+0xa93/0xd90 kernel/smp.c:969
Code: 04 03 84 c0 0f 85 84 00 00 00 45 8b 7d 00 44 89 fe 83 e6 01 31 ff e8 1c cf 0b 00 41 83 e7 01 75 07 e8 b1 cb 0b 00 eb 41 f3 90 <48> b8 00 00 00 00 00 fc ff df 0f b6 04 03 84 c0 75 11 41 f7 45 00
RSP: 0018:ffffc90003bd7580 EFLAGS: 00000293
RAX: ffffffff81746e24 RBX: 1ffff110173680b1 RCX: ffff888079f7d940

RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000

RBP: ffffc90003bd76c0 R08: ffffffff81746df4 R09: fffffbfff1f7a019
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000001
R13: ffff8880b9b40588 R14: ffff8880b9a3b380 R15: 0000000000000001
on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1135
on_each_cpu include/linux/smp.h:71 [inline]
text_poke_sync arch/x86/kernel/alternative.c:1201 [inline]
text_poke_bp_batch+0x2ad/0x830 arch/x86/kernel/alternative.c:1392
text_poke_flush arch/x86/kernel/alternative.c:1560 [inline]
text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1567

arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146
static_key_disable_cpuslocked+0xca/0x1b0 kernel/jump_label.c:207
static_key_disable+0x16/0x20 kernel/jump_label.c:215

tracepoint_remove_func kernel/tracepoint.c:417 [inline]
tracepoint_probe_unregister+0x6e6/0x980 kernel/tracepoint.c:551
bpf_raw_tp_link_release+0x5f/0x80 kernel/bpf/syscall.c:2900
bpf_link_free kernel/bpf/syscall.c:2471 [inline]
bpf_link_put+0x234/0x2c0 kernel/bpf/syscall.c:2497
bpf_link_release+0x37/0x40 kernel/bpf/syscall.c:2505
__fput+0x3bf/0x890 fs/file_table.c:280
task_work_run+0x129/0x1a0 kernel/task_work.c:164
exit_task_work include/linux/task_work.h:32 [inline]
do_exit+0x6a3/0x2480 kernel/exit.c:872
do_group_exit+0x144/0x310 kernel/exit.c:994
get_signal+0xc66/0x14e0 kernel/signal.c:2889
arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:867
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:172
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:208
__syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
syscall_exit_to_user_mode+0x5d/0x250 kernel/entry/common.c:301
do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f6ae688c1b5
Code: Unable to access opcode bytes at RIP 0x7f6ae688c18b.
RSP: 002b:00007f6ae4dc0010 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: fffffffffffffdfc RBX: 00007f6ae698f050 RCX: 00007f6ae688c1b5
RDX: 00007f6ae4dc0050 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f6ae68ad47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 000000000000006e R14: 00007f6ae698f050 R15: 00007fff11463668

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: c52b9710c83d Linux 5.15.156
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=13224e07180000
kernel config: https://syzkaller.appspot.com/x/.config?x=567b6ddc38438433

dashboard link: https://syzkaller.appspot.com/bug?extid=a871499fe9cf68fa0d04
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1659abcd180000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10c74610980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/1bd4b9969373/disk-c52b9710.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/10509e89bd25/vmlinux-c52b9710.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a623a4c52eb5/bzImage-c52b9710.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a87149...@syzkaller.appspotmail.com

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:

rcu: 1-...0: (1 GPs behind) idle=d2f/1/0x4000000000000000 softirq=4869/4873 fqs=2100
(detected by 0, t=10505 jiffies, g=3637, q=348)

Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1

CPU: 1 PID: 3518 Comm: syz-executor155 Not tainted 5.15.156-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:debug_deactivate+0x3/0x1e0 kernel/time/hrtimer.c:480
Code: 43 c9 10 00 0f 0b e9 0b ff ff ff e8 37 c9 10 00 e8 aa fa 90 ff e9 b7 fc ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 55 41 56 <53> 48 89 fb e8 14 c9 10 00 48 89 df 48 c7 c6 20 bc 8c 8a e8 45 de
RSP: 0018:ffffc90000dd0d48 EFLAGS: 00000046
RAX: ffffffff816f6369 RBX: ffff8880b9b2a2c8 RCX: ffff888022c80000
RDX: 0000000000010002 RSI: 0000000000000001 RDI: ffff88807915db40
RBP: ffffc90000dd0eb0 R08: ffffffff816f635c R09: ffff88807915db48
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8880b9b2a200
R13: ffff8880b9b2a280 R14: ffff88807915db40 R15: dffffc0000000000
FS: 00005555570d4380(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00005555570d4ca8 CR3: 0000000019cb3000 CR4: 00000000003506e0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<NMI>
</NMI>
<IRQ>

__run_hrtimer kernel/time/hrtimer.c:1654 [inline]
__hrtimer_run_queues+0x31d/0xcf0 kernel/time/hrtimer.c:1750

hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1812
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline]
__sysvec_apic_timer_interrupt+0x139/0x470 arch/x86/kernel/apic/apic.c:1102
sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1096
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638

RIP: 0010:unwind_next_frame+0x14f/0x1fa0
Code: 83 15 00 00 49 8d 6f 35 49 89 ec 49 c1 ec 03 41 0f b6 04 14 84 c0 0f 85 f1 16 00 00 4c 0f be 6d 00 48 8b 44 24 28 80 3c 10 00 <48> 8b 5c 24 08 74 12 48 89 df e8 c2 98 91 00 48 ba 00 00 00 00 00
RSP: 0018:ffffc90002c97488 EFLAGS: 00000246
RAX: 1ffff92000592ebd RBX: 0000000000000000 RCX: ffffffff8a272900
RDX: dffffc0000000000 RSI: ffffc90002c98000 RDI: ffffffff8138883b
RBP: ffffc90002c975d5 R08: dffffc0000000001 R09: ffffc90002c975a0
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff92000592eba
R13: 0000000000000000 R14: ffffffff8138a91f R15: ffffc90002c975a0
__unwind_start+0x59d/0x720 arch/x86/kernel/unwind_orc.c:704
unwind_start arch/x86/include/asm/unwind.h:60 [inline]
arch_stack_walk+0xdb/0x140 arch/x86/kernel/stacktrace.c:24
stack_trace_save+0x113/0x1c0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
____kasan_kmalloc+0xba/0xf0 mm/kasan/common.c:513
kasan_kmalloc include/linux/kasan.h:264 [inline]
__kmalloc+0x168/0x300 mm/slub.c:4407
kmalloc include/linux/slab.h:596 [inline]
kzalloc include/linux/slab.h:721 [inline]
lsm_cred_alloc security/security.c:539 [inline]
security_prepare_creds+0x48/0x130 security/security.c:1725
prepare_creds+0x459/0x610 kernel/cred.c:291
copy_creds+0x149/0xca0 kernel/cred.c:365
copy_process+0x8a7/0x3ef0 kernel/fork.c:2070

kernel_clone+0x210/0x960 kernel/fork.c:2604
__do_sys_clone kernel/fork.c:2721 [inline]
__se_sys_clone kernel/fork.c:2705 [inline]
__x64_sys_clone+0x23f/0x290 kernel/fork.c:2705
do_syscall_x64 arch/x86/entry/common.c:50 [inline]

do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fbc98444e63

Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00

RSP: 002b:00007ffedba542b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbc98444e63

RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011

RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000010
R10: 00005555570d4650 R11: 0000000000000246 R12: 0000000000000001
R13: 000000000002efa9 R14: 00007ffedba543dc R15: 0000000000000003
</TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.888 msecs


---
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