rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5199/1:b..l P5965/1:b..l P8328/3:b..l
rcu: (detected by 0, t=10502 jiffies, g=17853, q=568 ncpus=2)
task:syz-executor state:R running task stack:27832 pid:8328 tgid:8328 ppid:5966 task_flags:0x400040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5258 [inline]
__schedule+0x150e/0x5070 kernel/sched/core.c:6866
preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:7050
preempt_schedule+0xae/0xc0 kernel/sched/core.c:7074
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
_raw_spin_unlock+0x3f/0x50 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:391 [inline]
filemap_map_pages+0x1939/0x1fa0 mm/filemap.c:3931
do_fault_around mm/memory.c:5713 [inline]
do_read_fault mm/memory.c:5746 [inline]
do_fault mm/memory.c:5889 [inline]
do_pte_missing+0x20b2/0x3330 mm/memory.c:4401
handle_pte_fault mm/memory.c:6273 [inline]
__handle_mm_fault mm/memory.c:6411 [inline]
handle_mm_fault+0x1b26/0x32b0 mm/memory.c:6580
do_user_addr_fault+0xa7c/0x1380 arch/x86/mm/fault.c:1336
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x82/0x100 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f3a08daa51b
RSP: 002b:00007fff9cdcd488 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 00007fff9cdcd9f0 RCX: 00007fff9cdcd997
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000002
RBP: 0000000000000016 R08: 00007f3a08e51760 R09: cccccccccccccccd
R10: 00000000ffffffff R11: 0000000000000001 R12: 0000000000000075
R13: 00007fff9cdcdb70 R14: 00007fff9cdcd998 R15: 0000000000000002
task:syz-executor state:R running task stack:20952 pid:5965 tgid:5965 ppid:5960 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5258 [inline]
__schedule+0x150e/0x5070 kernel/sched/core.c:6866
preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:7050
preempt_schedule+0xae/0xc0 kernel/sched/core.c:7074
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
_raw_spin_unlock+0x3f/0x50 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:391 [inline]
copy_pte_range mm/memory.c:1331 [inline]
copy_pmd_range+0x7773/0x8060 mm/memory.c:1392
copy_pud_range mm/memory.c:1429 [inline]
copy_p4d_range mm/memory.c:1453 [inline]
copy_page_range+0xb88/0x11d0 mm/memory.c:1535
dup_mmap+0xf4a/0x1b80 mm/mmap.c:1827
dup_mm kernel/fork.c:1533 [inline]
copy_mm+0x14f/0x770 kernel/fork.c:1585
copy_process+0x165d/0x3950 kernel/fork.c:2225
kernel_clone+0x21e/0x820 kernel/fork.c:2655
__do_sys_clone kernel/fork.c:2796 [inline]
__se_sys_clone kernel/fork.c:2780 [inline]
__x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2780
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc8cdb85e93
RSP: 002b:00007ffc9286ebf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc8cdb85e93
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 000055556b2467d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000927c0 R14: 0000000000034dd8 R15: 00007ffc9286ed90
task:udevd state:R running task stack:25072 pid:5199 tgid:5199 ppid:1 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5258 [inline]
__schedule+0x150e/0x5070 kernel/sched/core.c:6866
preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7193
irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:on_stack arch/x86/include/asm/stacktrace.h:58 [inline]
RIP: 0010:stack_access_ok arch/x86/kernel/unwind_orc.c:409 [inline]
RIP: 0010:deref_stack_reg arch/x86/kernel/unwind_orc.c:419 [inline]
RIP: 0010:unwind_next_frame+0xd65/0x23d0 arch/x86/kernel/unwind_orc.c:600
Code: 66 10 48 b8 00 00 00 00 00 fc ff df 48 8b 4c 24 20 0f b6 04 01 84 c0 0f 85 58 11 00 00 41 83 3e 00 0f 95 c0 49 39 df 0f 96 c1 <20> c1 49 39 dc 0f 97 c0 20 c8 3c 01 75 18 48 8d 43 08 4c 39 f8 0f
RSP: 0018:ffffc900033e7398 EFLAGS: 00000283
RAX: 0000000000000001 RBX: ffffc900033e7ac0 RCX: 1ffff9200067ce01
RDX: ffffffff90ff6776 RSI: 0000000000000002 RDI: ffffffff8be24780
RBP: 1ffff9200067ce8e R08: 0000000000000001 R09: ffffffff8e33f2e0
R10: ffffc900033e74b8 R11: ffffffff81addd50 R12: ffffc900033e8000
R13: 1ffff9200067ce8f R14: ffffc900033e7468 R15: ffffc900033e0000
arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
unpoison_slab_object mm/kasan/common.c:340 [inline]
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4953 [inline]
slab_alloc_node mm/slub.c:5267 [inline]
kmem_cache_alloc_noprof+0x37d/0x710 mm/slub.c:5274
skb_clone+0x212/0x3a0 net/core/skbuff.c:2087
do_one_broadcast net/netlink/af_netlink.c:1455 [inline]
netlink_broadcast_filtered+0x6ae/0x1000 net/netlink/af_netlink.c:1533
netlink_broadcast+0x37/0x50 net/netlink/af_netlink.c:1557
uevent_net_broadcast_untagged lib/kobject_uevent.c:331 [inline]
kobject_uevent_net_broadcast+0x378/0x560 lib/kobject_uevent.c:410
kobject_uevent_env+0x55c/0x9f0 lib/kobject_uevent.c:608
kobject_synth_uevent+0x527/0xb00 lib/kobject_uevent.c:207
uevent_store+0x26/0x70 drivers/base/core.c:2773
kernfs_fop_write_iter+0x3af/0x540 fs/kernfs/file.c:352
new_sync_write fs/read_write.c:593 [inline]
vfs_write+0x5c9/0xb30 fs/read_write.c:686
ksys_write+0x145/0x250 fs/read_write.c:738
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7c154a7407
RSP: 002b:00007ffc48e4c800 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f7c15c2d880 RCX: 00007f7c154a7407
RDX: 0000000000000007 RSI: 0000560d9acf0d80 RDI: 000000000000000c
RBP: 0000560d9acf0d80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000007
R13: 0000560d9ac64730 R14: 00007f7c155efea0 R15: 00007ffc48e4cb40
rcu: rcu_preempt kthread starved for 10597 jiffies! g17853 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:27168 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5258 [inline]
__schedule+0x150e/0x5070 kernel/sched/core.c:6866
__schedule_loop kernel/sched/core.c:6948 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6963
schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 8327 Comm: syz.0.1133 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:mark_usage kernel/locking/lockdep.c:-1 [inline]
RIP: 0010:__lock_acquire+0x616/0x2cf0 kernel/locking/lockdep.c:5191
Code: 00 00 83 7c 24 10 00 0f 84 a8 00 00 00 41 8b 45 20 66 85 c0 0f 88 8c 00 00 00 65 8b 0d df ca 25 11 a9 00 00 03 00 74 39 85 c9 <48> 8b 5c 24 08 74 18 48 89 df 4c 89 ee ba 01 00 00 00 e8 23 48 00
RSP: 0000:ffffc9000b5c79d8 EFLAGS: 00000046
RAX: 00000000000501c4 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000004 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88802e100b30 R08: ffffffff820fed90 R09: ffff8880797828c0
R10: dffffc0000000000 R11: fffff520016b8f46 R12: ffffffffffffff05
R13: ffff88802e100b30 R14: ffff88802e100000 R15: ffff88802e100b30
FS: 00007fabb49a86c0(0000) GS:ffff888125adc000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000058 CR3: 000000007a45e000 CR4: 00000000003526f0
Call Trace:
lock_acquire+0x117/0x340 kernel/locking/lockdep.c:5868
__might_fault+0xcc/0x130 mm/memory.c:7174
_inline_copy_to_user include/linux/uaccess.h:201 [inline]
_copy_to_user+0x2c/0xb0 lib/usercopy.c:26
copy_to_user include/linux/uaccess.h:236 [inline]
copy_siginfo_to_user+0x22/0xc0 kernel/signal.c:3501
x64_setup_rt_frame+0x776/0xd40 arch/x86/kernel/signal_64.c:194
setup_rt_frame arch/x86/kernel/signal.c:250 [inline]
handle_signal arch/x86/kernel/signal.c:294 [inline]
arch_do_signal_or_restart+0x3d1/0x7a0 arch/x86/kernel/signal.c:339
__exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
exit_to_user_mode_loop kernel/entry/common.c:75 [inline]
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:270 [inline]
irqentry_exit_to_user_mode include/linux/irq-entry-common.h:339 [inline]
irqentry_exit+0x177/0x660 kernel/entry/common.c:196
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0033:0x7fabb3b8f747
Code: ff ff 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
RSP: 002b:00007fabb49a80e8 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007fabb3de5fa8 RCX: 00007fabb3b8f749
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fabb3de5fa8
RBP: 00007fabb3de5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fabb3de6038 R14: 00007ffc3b0c1530 R15: 00007ffc3b0c1618