rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P14263/1:b..l P14033/1:b..l P14257/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=212249, q=913 ncpus=1)
task:syz-executor state:R running task stack:24232 pid:14257 tgid:14257 ppid:5598 task_flags:0x400000 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5520 [inline]
__schedule+0x17db/0x58f0 kernel/sched/core.c:7270
preempt_schedule_common+0x7f/0xd0 kernel/sched/core.c:7449
preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:201 [inline]
_raw_spin_unlock+0x41/0x50 kernel/locking/spinlock.c:213
spin_unlock include/linux/spinlock.h:401 [inline]
insert_page+0x2db/0x440 mm/memory.c:2539
kcov_mmap+0xc9/0x140 kernel/kcov.c:527
vfs_mmap include/linux/fs.h:2064 [inline]
mmap_file mm/internal.h:238 [inline]
__mmap_new_file_vma mm/vma.c:2595 [inline]
__mmap_new_vma mm/vma.c:2668 [inline]
__mmap_region mm/vma.c:2879 [inline]
mmap_region+0x193b/0x2240 mm/vma.c:2964
do_mmap+0xe0a/0x1300 mm/mmap.c:573
vm_mmap_pgoff+0x272/0x4e0 mm/util.c:581
ksys_mmap_pgoff+0x4dc/0x760 mm/mmap.c:619
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f201a19dec2
RSP: 002b:00007ffd16e67468 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f20193fb000 RCX: 00007f201a19dec2
RDX: 0000000000000003 RSI: 0000000000400000 RDI: 00007f20193fb000
RBP: 0000000000000011 R08: 00000000000000da R09: 0000000000000000
R10: 0000000000000011 R11: 0000000000000206 R12: 0000000000000003
R13: 0000000000000003 R14: 00007ffd16e676d8 R15: 0000000000000000
task:udevd state:R running task stack:25200 pid:14033 tgid:14033 ppid:4978 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5520 [inline]
__schedule+0x17db/0x58f0 kernel/sched/core.c:7270
preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7592
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x14f/0x910 kernel/entry/common.c:167
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:lock_release+0x2e1/0x3c0 kernel/locking/lockdep.c:5934
Code: 76 f1 11 00 00 00 00 eb b5 e8 1b f6 40 0a f7 c3 00 02 00 00 74 b9 65 48 8b 05 73 31 f1 11 48 3b 44 24 28 75 48 fb 48 83 c4 30 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 3b f2 6c ff cc 48 8d 3d 68 03 da
RSP: 0018:ffffc9000334f148 EFLAGS: 00000286
RAX: dcf5aa456e75d400 RBX: 0000000000000206 RCX: 0000000000000046
RDX: ffffc9000334f201 RSI: ffffffff8e6fceb0 RDI: ffffffff8c6d9480
RBP: ffff88801df38bb0 R08: ffffc9000334f488 R09: ffffc9000334f278
R10: dffffc0000000000 R11: fffff52000669e51 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff8ed5c6e0 R15: ffff88801df38000
rcu_lock_release include/linux/rcupdate.h:319 [inline]
rcu_read_unlock include/linux/rcupdate.h:880 [inline]
class_rcu_destructor include/linux/rcupdate.h:1216 [inline]
unwind_next_frame+0x1baa/0x2550 arch/x86/kernel/unwind_orc.c:709
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
save_stack+0x122/0x230 mm/page_owner.c:183
__reset_page_owner+0x71/0x1f0 mm/page_owner.c:338
reset_page_owner include/linux/page_owner.h:26 [inline]
__free_pages_prepare mm/page_alloc.c:1418 [inline]
free_unref_folios+0xdc2/0x14e0 mm/page_alloc.c:3022
folios_put_refs+0x9e9/0xb30 mm/folio.c:1034
folio_batch_release include/linux/folio_batch.h:101 [inline]
shmem_undo_range+0x4e6/0x15d0 mm/shmem.c:1161
shmem_truncate_range mm/shmem.c:1289 [inline]
shmem_evict_inode+0x247/0xae0 mm/shmem.c:1420
evict+0x624/0xb50 fs/inode.c:822
dentry_kill+0x1b9/0x880 fs/dcache.c:826
finish_dput+0x1a/0x260 fs/dcache.c:1001
__fput+0x675/0xa50 fs/file_table.c:520
task_work_run+0x1d9/0x270 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:70 [inline]
exit_to_user_mode_loop+0x204/0x770 kernel/entry/common.c:101
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:336 [inline]
do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7652dcc407
RSP: 002b:00007ffc1d7902e0 EFLAGS: 00000202 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 00007f7652d40880 RCX: 00007f7652dcc407
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000008
RBP: 00007f7652d406e8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000002
R13: 000055aa01f12190 R14: 0000000000000008 R15: 000055aa01f17e20
task:sed state:R running task stack:26920 pid:14263 tgid:14263 ppid:14260 task_flags:0x400000 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5520 [inline]
__schedule+0x17db/0x58f0 kernel/sched/core.c:7270
preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7592
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x14f/0x910 kernel/entry/common.c:167
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__rcu_read_unlock+0x0/0xe0 kernel/rcu/tree_plugin.h:431
Code: d9 80 e1 07 80 c1 03 38 c1 7c dc 48 89 df e8 07 91 8a 00 eb d2 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 41 57 41 56 41 55 41 54 53 49 bf 00 00 00 00 00 fc ff
RSP: 0018:ffffc900056ef2b8 EFLAGS: 00000286
RAX: a901727586fea000 RBX: ffffc900056ef378 RCX: 0000000000000046
RDX: ffffffff91203e01 RSI: ffffffff8e6fceb0 RDI: ffffffff8c6d9480
RBP: 1ffffffff2240701 R08: ffffc900056ef6f8 R09: ffffc900056ef3b8
R10: dffffc0000000000 R11: fffff52000adde79 R12: ffffc900056e8000
R13: ffffffff8177f22f R14: ffffc900056ef368 R15: ffffc900056ef6f8
rcu_read_unlock include/linux/rcupdate.h:882 [inline]
class_rcu_destructor include/linux/rcupdate.h:1216 [inline]
unwind_next_frame+0x1baf/0x2550 arch/x86/kernel/unwind_orc.c:709
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
__call_rcu_common kernel/rcu/tree.c:3181 [inline]
call_rcu+0xee/0x8b0 kernel/rcu/tree.c:3301
slab_free_hook mm/slub.c:2712 [inline]
slab_free mm/slub.c:6499 [inline]
kmem_cache_free+0x471/0x650 mm/slub.c:6626
tear_down_vmas+0x31f/0x530 mm/mmap.c:1277
exit_mmap+0x4ca/0x9f0 mm/mmap.c:1335
__mmput+0x118/0x420 kernel/fork.c:1193
exec_mm_put_old fs/exec.c:919 [inline]
setup_new_exec+0x30d/0x360 fs/exec.c:1380
load_elf_binary+0xbc0/0x28d0 fs/binfmt_elf.c:1024
search_binary_handler fs/exec.c:1759 [inline]
exec_binprm fs/exec.c:1791 [inline]
bprm_execve+0x930/0x1590 fs/exec.c:1847
do_execveat_common+0x4f4/0x670 fs/exec.c:1945
__do_sys_execve fs/exec.c:2018 [inline]
__se_sys_execve fs/exec.c:2012 [inline]
__x64_sys_execve+0x97/0xc0 fs/exec.c:2012
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f44fc969107
RSP: 002b:00007ffd37775938 EFLAGS: 00000246 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 0000562686871078 RCX: 00007f44fc969107
RDX: 00005626868710a0 RSI: 0000562686871078 RDI: 0000562686871130
RBP: 0000562686871130 R08: 00007ffd37779e87 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000246 R12: 00005626868710a0
R13: 00007f44fcb2ee8b R14: 00005626868710a0 R15: 0000000000000000
rcu: rcu_preempt kthread starved for 10502 jiffies! g212249 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->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:27496 pid:17 tgid:17 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5520 [inline]
__schedule+0x17db/0x58f0 kernel/sched/core.c:7270
__schedule_loop kernel/sched/core.c:7347 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7362
schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2122
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2330
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 14262 Comm: syz.8.1261 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:220 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:229
Code: 90 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 1a 4d bc f5 48 89 df e8 d2 c4 bc f5 e8 cd 01 e9 f5 fb bf 01 00 00 00 82 de ad f5 65 48 8b 05 2a 81 ad 07 48 85 c0 74 07 5b e9 1a 42
RSP: 0018:ffffc9000585fc78 EFLAGS: 00000206
RAX: 000000000436301b RBX: ffff888034f64a00 RCX: 8000000000000001
RDX: 0000000000000000 RSI: ffffffff8e474cae RDI: 0000000000000001
RBP: 0000000000000000 R08: ffffffff907a157f R09: 1ffffffff20f42af
R10: dffffc0000000000 R11: fffffbfff20f42b0 R12: 0000000000000021
R13: ffff888034f64e98 R14: 000000001c000004 R15: dffffc0000000000
FS: 00007f0c747a36c0(0000) GS:ffff888124cd8000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000058 CR3: 000000007fc2b000 CR4: 0000000000350ef0
Call Trace:
spin_unlock_irq include/linux/spinlock.h:413 [inline]
get_signal+0x1136/0x12c0 kernel/signal.c:3042
arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
exit_to_user_mode_loop+0x10e/0x770 kernel/entry/common.c:101
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:336 [inline]
do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0c7399e157
Code: 83 c8 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
RSP: 002b:00007f0c747a30e8 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007f0c73c25fa8 RCX: 00007f0c7399e159
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f0c73c25fa8
RBP: 00007f0c73c25fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0c73c26038 R14: 00007fffb7022200 R15: 00007fffb70222e8