rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P4265/1:b..l P7973/1:b..l P7982/1:b..l
(detected by 1, t=10502 jiffies, g=32941, q=49 ncpus=2)
task:syz.6.1155 state:R running task stack:26944 pid:7982 ppid:4540 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10ec/0x40b0 kernel/sched/core.c:6561
preempt_schedule_notrace+0xca/0x110 kernel/sched/core.c:6823
preempt_schedule_notrace_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:35
rcu_is_watching+0x76/0xa0 kernel/rcu/tree.c:722
trace_lock_acquire include/trace/events/lock.h:24 [inline]
lock_acquire+0xe8/0x490 kernel/locking/lockdep.c:5633
rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
rcu_read_lock include/linux/rcupdate.h:791 [inline]
nl80211_netlink_notify+0x97/0x800 net/wireless/nl80211.c:19612
notifier_call_chain kernel/notifier.c:87 [inline]
blocking_notifier_call_chain+0x103/0x1b0 kernel/notifier.c:382
netlink_release+0x111d/0x19c0 net/netlink/af_netlink.c:766
__sock_release net/socket.c:654 [inline]
sock_close+0xd5/0x240 net/socket.c:1400
__fput+0x22c/0x920 fs/file_table.c:320
task_work_run+0x1ca/0x250 kernel/task_work.c:203
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7ff74738db2a
RSP: 002b:00007ff74829bf90 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000026 RCX: 00007ff74738db2a
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000007
RBP: 0000000000000007 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007ff7475e6218 R14: 00007ff7475e6180 R15: 00007ffede6a7f68
task:dhcpcd-run-hook state:R running task stack:24352 pid:7973 ppid:3934 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10ec/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:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:244 [inline]
RIP: 0010:__sanitizer_cov_trace_cmp8+0x4/0x80 kernel/kcov.c:293
Code: 77 22 89 ff 89 f6 49 ff c0 4c 89 01 48 c7 44 11 08 04 00 00 00 48 89 7c 11 10 48 89 74 11 18 48 89 44 11 20 c3 90 48 8b 04 24 <65> 48 8b 0d 64 9e 81 7e 65 8b 15 65 9e 81 7e 81 e2 00 01 ff 00 74
RSP: 0018:ffffc9000c6e7898 EFLAGS: 00000293
RAX: ffffffff8a0522fc RBX: 0000000000000010 RCX: 000000008bb15b01
RDX: 0000000000000000 RSI: 0000000000000010 RDI: 0000000000000001
RBP: ffffc9000c6e7a70 R08: ffff8880184b0000 R09: 0000000000000004
R10: 0000000000000003 R11: 0000000000000000 R12: dffffc0000000000
R13: ffffffff8bb15ba1 R14: 0000000000000001 R15: 0000000000000001
mas_validate_gaps lib/maple_tree.c:6972 [inline]
mt_validate+0x2a6c/0x4c90 lib/maple_tree.c:7244
validate_mm_mt+0xcd/0x420 mm/mmap.c:295
__split_vma+0x30/0x500 mm/mmap.c:2355
mprotect_fixup+0x597/0x7f0 mm/mprotect.c:623
do_mprotect_pkey+0x754/0xa40 mm/mprotect.c:792
__do_sys_mprotect mm/mprotect.c:819 [inline]
__se_sys_mprotect mm/mprotect.c:816 [inline]
__x64_sys_mprotect+0x7c/0x90 mm/mprotect.c:816
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: 0033:0x7fc0aa4c32c7
RSP: 002b:00007fffcba04168 EFLAGS: 00000206 ORIG_RAX: 000000000000000a
RAX: ffffffffffffffda RBX: 00007fc0aa4a0580 RCX: 00007fc0aa4c32c7
RDX: 0000000000000001 RSI: 0000000000001000 RDI: 00007fc0aa1e1000
RBP: 00007fffcba04430 R08: 0000000000000000 R09: 00007fc0aa2352e0
R10: 00007fc0aa4a0580 R11: 0000000000000206 R12: 0000000000000020
R13: 0000007bec8f95c2 R14: 0000000000000000 R15: 00007fc0aa4d7310
task:syz-executor state:R running task stack:22144 pid:4265 ppid:4263 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10ec/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_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:696
RIP: 0010:step_into+0x8f5/0xf10 fs/namei.c:1842
Code: 0f ee ff e9 5d fe ff ff 48 8b 4c 24 18 80 e1 07 80 c1 03 38 c1 0f 8c 02 ff ff ff 48 8b 7c 24 18 e8 20 0f ee ff e9 f3 fe ff ff <43> 0f b6 04 3c 84 c0 0f 85 24 05 00 00 48 8b 44 24 08 8b 30 89 74
RSP: 0018:ffffc90003d17ac0 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffc90003d17ca0 RCX: 0000000000000001
RDX: ffff88802d6ed940 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90003d17bc8 R08: dffffc0000000000 R09: ffffed100a88440f
R10: ffffed100a88440f R11: 1ffff1100a88440e R12: 1ffff920007a2f9b
R13: ffff888054422000 R14: ffff8880761f6640 R15: dffffc0000000000
lookup_last fs/namei.c:2455 [inline]
path_lookupat+0x169/0x440 fs/namei.c:2479
filename_lookup+0x1f0/0x500 fs/namei.c:2508
user_path_at_empty+0x3e/0x60 fs/namei.c:2905
user_path_at include/linux/namei.h:57 [inline]
ksys_umount fs/namespace.c:1820 [inline]
__do_sys_umount fs/namespace.c:1828 [inline]
__se_sys_umount fs/namespace.c:1826 [inline]
__x64_sys_umount+0xf1/0x160 fs/namespace.c:1826
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: 0033:0x7f2e989901f7
RSP: 002b:00007ffca5840b08 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2e989901f7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffca5840bc0
RBP: 00007ffca5840bc0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffca5841c50
R13: 00007f2e98a11d7d R14: 0000000000039e7b R15: 00007ffca5841c90
rcu: rcu_preempt kthread timer wakeup didn't happen for 10548 jiffies! g32941 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=14158
rcu: rcu_preempt kthread starved for 10554 jiffies! g32941 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27552 pid:16 ppid:2 flags:0x00004000
Call Trace:
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
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: 7979 Comm: syz.7.1161 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:unwind_next_frame+0x1876/0x20b0 arch/x86/kernel/unwind_orc.c:629
Code: 84 c0 0f 85 41 08 00 00 41 80 3e 00 75 47 80 3d 97 94 d2 0c 00 75 3e c6 05 8e 94 d2 0c 01 48 c7 c7 40 79 89 8a e9 9d fa ff ff 01 00 00 00 e8 50 39 1f 00 65 8b 0d 51 f2 c9 7e b0 01 85 c9 75
RSP: 0018:ffffc900061475f0 EFLAGS: 00000006
RAX: ffffc90006148000 RBX: ffffc900061476c8 RCX: ffffc90006147808
RDX: ffffc90006147701 RSI: dffffc0000000000 RDI: ffffc900061476d0
RBP: ffffffff8ea2368c R08: ffffc900061477f0 R09: ffffc90006147718
R10: fffff52000c28ee5 R11: 1ffff92000c28ee3 R12: ffffc90006140000
R13: dffffc0000000000 R14: ffffc900061476d8 R15: ffffc90006147800
FS: 00007f6edf98a6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6edede6098 CR3: 0000000065e47000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x98/0xe0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
kasan_save_free_info+0x2d/0x50 mm/kasan/generic.c:516
____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:236
kasan_slab_free include/linux/kasan.h:177 [inline]
slab_free_hook mm/slub.c:1729 [inline]
slab_free_freelist_hook+0x131/0x1a0 mm/slub.c:1755
slab_free mm/slub.c:3687 [inline]
kmem_cache_free+0xf7/0x290 mm/slub.c:3709
__sigqueue_free kernel/signal.c:459 [inline]
collect_signal kernel/signal.c:602 [inline]
__dequeue_signal+0x4e9/0x610 kernel/signal.c:624
dequeue_signal+0xe5/0x4b0 kernel/signal.c:647
get_signal+0x547/0x1350 kernel/signal.c:2751
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+0xee/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f6edeb8eec9
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:00007f6edf98a0e8 EFLAGS: 00000246
RAX: fffffffffffffffc RBX: 00007f6edede6098 RCX: 00007f6edeb8eec9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f6edede6098
RBP: 00007f6edede6090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6edede6128 R14: 00007ffdf9878a70 R15: 00007ffdf9878b58
sched: RT throttling activated