rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P4373/1:b..l P46/1:b..l P4402/1:b..l
(detected by 1, t=10503 jiffies, g=23317, q=12 ncpus=2)
task:udevd state:R running task stack:24224 pid:4402 ppid:3638 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_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:696
RIP: 0010:lock_is_held_type+0x13a/0x190 kernel/locking/lockdep.c:5710
Code: 75 40 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 46 41 f7 c5 00 02 00 00 74 01 fb 65 48 8b 04 25 28 00 00 00 <48> 3b 44 24 08 75 3c 89 e8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffffc90004547898 EFLAGS: 00000206
RAX: 75b81a6ef93da100 RBX: ffff888026f55940 RCX: 75b81a6ef93da100
RDX: 0000000000000000 RSI: ffffffff8a8c1680 RDI: ffffffff8adefce0
RBP: 0000000000000001 R08: 0000000000000004 R09: 0000000000000003
R10: fffffbfff2e0b094 R11: 1ffffffff2e0b094 R12: 0000000000000000
R13: 0000000000000246 R14: ffff88807d986a58 R15: ffff888026f56420
lock_is_held include/linux/lockdep.h:283 [inline]
mt_locked lib/maple_tree.c:-1 [inline]
mt_slot lib/maple_tree.c:814 [inline]
mas_slot lib/maple_tree.c:847 [inline]
mas_validate_parent_slot lib/maple_tree.c:7051 [inline]
mt_validate+0xf7b/0x4c90 lib/maple_tree.c:7240
validate_mm_mt+0xcd/0x420 mm/mmap.c:295
validate_mm+0xcc/0x2b0 mm/mmap.c:332
do_mmap+0xc7/0xfd0 mm/mmap.c:1270
vm_mmap_pgoff+0x1b2/0x2b0 mm/util.c:520
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: 0033:0x7f391551d822
RSP: 002b:00007ffd759bb8d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f391551d822
RDX: 0000000000000003 RSI: 0000000000000200 RDI: 0000000000000000
RBP: 0000000000000022 R08: 00000000ffffffff R09: 0000000000000000
R10: 0000000000000022 R11: 0000000000000246 R12: 0000000000000018
R13: 0000000000001000 R14: 000055bb5526a0b0 R15: 0000000000000200
task:kworker/u4:3 state:R running task stack:25680 pid:46 ppid:2 flags:0x00004000
Workqueue: bat_events batadv_nc_worker
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:lock_acquire+0x20f/0x490 kernel/locking/lockdep.c:5666
Code: 00 9c 8f 84 24 80 00 00 00 f6 84 24 81 00 00 00 02 0f 85 f5 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 44 3d 00 00 00 00 00 66 43 c7 44 3d 09 00 00 43 c6 44 3d 0b
RSP: 0018:ffffc90000b77ac0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 1e0f653c0729ac00
RDX: 0000000000000000 RSI: ffffffff8a8c1680 RDI: ffffffff8adefce0
RBP: ffffc90000b77bc8 R08: dffffc0000000000 R09: fffffbfff215c449
R10: fffffbfff215c449 R11: 1ffffffff215c448 R12: 0000000000000001
R13: 1ffff9200016ef64 R14: 0000000000000246 R15: dffffc0000000000
rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
rcu_read_lock include/linux/rcupdate.h:791 [inline]
batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline]
batadv_nc_worker+0xeb/0x600 net/batman-adv/network-coding.c:719
process_one_work+0x898/0x1160 kernel/workqueue.c:2292
worker_thread+0xaa2/0x1250 kernel/workqueue.c:2439
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
task:udevd state:R running task stack:24656 pid:4373 ppid:3638 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_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:696
RIP: 0010:debug_lockdep_rcu_enabled+0x0/0x30 kernel/rcu/update.c:279
Code: 42 08 04 00 75 e8 48 c7 c7 a0 03 8c 8a 48 c7 c6 80 27 8c 8a e8 01 92 35 f7 0f 0b eb d1 00 00 cc cc 00 00 cc cc 00 00 cc cc 00 <31> c0 83 3d 37 0f 08 04 00 74 1d 83 3d c2 42 08 04 00 74 14 65 48
RSP: 0018:ffffc900041677b8 EFLAGS: 00000202
RAX: 0000000080000001 RBX: ffffffff81e46af7 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 00000000ffffffff
RBP: 0000000000000001 R08: dffffc0000000000 R09: ffffed1002f14ccf
R10: ffffed1002f14ccf R11: 1ffff11002f14cce R12: 1ffff9200082cf0c
R13: ffff88802710dbe8 R14: ffff8880178a65e0 R15: dffffc0000000000
rcu_read_unlock include/linux/rcupdate.h:820 [inline]
dput+0x115/0x1d0 fs/dcache.c:906
step_into+0x33f/0xf10 fs/namei.c:1851
walk_component fs/namei.c:2004 [inline]
link_path_walk+0x6be/0xe50 fs/namei.c:2325
path_lookupat+0x9d/0x440 fs/namei.c:2478
filename_lookup+0x1f0/0x500 fs/namei.c:2508
vfs_statx+0x109/0x650 fs/stat.c:229
vfs_fstatat fs/stat.c:267 [inline]
__do_sys_newfstatat fs/stat.c:437 [inline]
__se_sys_newfstatat fs/stat.c:431 [inline]
__x64_sys_newfstatat+0x155/0x1e0 fs/stat.c:431
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: 0033:0x7f3915511b0a
RSP: 002b:00007ffd759ba2d8 EFLAGS: 00000202 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 00007ffd759bb800 RCX: 00007f3915511b0a
RDX: 00007ffd759ba2e0 RSI: 00007ffd759ba370 RDI: 00000000ffffff9c
RBP: 000055bb55271830 R08: 00007ffd759bb800 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000202 R12: 000055bb55271920
R13: 00007ffd759ba370 R14: 000055bb55274410 R15: 00007ffd759bc000
rcu: rcu_preempt kthread starved for 10595 jiffies! g23317 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:27840 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: 5851 Comm: syz.5.268 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:__lock_acquire+0x5a00/0x7c50 kernel/locking/lockdep.c:5076
Code: 00 00 00 00 49 b8 00 00 00 00 00 fc ff df 48 c7 84 24 20 01 00 00 0e 36 e0 45 48 8b 84 24 f0 00 00 00 42 c7 04 00 00 00 00 00 <4a> c7 44 00 0b 00 00 00 00 42 c7 44 00 17 00 00 00 00 42 c6 44 00
RSP: 0018:ffffc900000079c0 EFLAGS: 00000087
RAX: 1ffff92000000f5c RBX: ffff888078774658 RCX: ffffffff81630a00
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff90ae2248
RBP: ffffc90000007c10 R08: dffffc0000000000 R09: fffffbfff215c44a
R10: fffffbfff215c44a R11: 1ffffffff215c449 R12: ffffffff9068ca28
R13: 00000000c2fbef46 R14: c17b0293a276ea01 R15: ffff888078774650
FS: 00007f651a41a6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c402549 CR3: 0000000062353000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662
seqcount_lockdep_reader_access+0xc6/0x1c0 include/linux/seqlock.h:102
timekeeping_get_delta kernel/time/timekeeping.c:254 [inline]
timekeeping_get_ns kernel/time/timekeeping.c:388 [inline]
ktime_get_update_offsets_now+0x95/0x3e0 kernel/time/timekeeping.c:2320
hrtimer_update_base kernel/time/hrtimer.c:659 [inline]
hrtimer_interrupt+0x130/0x9c0 kernel/time/hrtimer.c:1855
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
__sysvec_apic_timer_interrupt+0x153/0x5a0 arch/x86/kernel/apic/apic.c:1124
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
Code: f5 ff 0f 1f 00 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 ee f7 41 f7 48 89 df e8 46 bd 42 f7 e8 71 af 65 f7 fb bf 01 00 00 00 96 3a 36 f7 65 8b 05 97 f3 e0 75 85 c0 74 02 5b c3 e8 e4 04 df
RSP: 0018:ffffc90004727bb8 EFLAGS: 00000286
RAX: 746240e18ccadf00 RBX: ffff888057962500 RCX: 746240e18ccadf00
RDX: dffffc0000000000 RSI: ffffffff8a8c0500 RDI: 0000000000000001
RBP: ffff888057962998 R08: dffffc0000000000 R09: ffffed100af2c4a1
R10: ffffed100af2c4a1 R11: 1ffff1100af2c4a0 R12: 1ffff1100af2c533
R13: 0000000000000021 R14: dffffc0000000000 R15: 0000000000000000
spin_unlock_irq include/linux/spinlock.h:401 [inline]
get_signal+0x1163/0x1350 kernel/signal.c:2874
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: 0033:0x7f651958eec7
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:00007f651a41a0e8 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007f65197e5fa8 RCX: 00007f651958eec9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f65197e5fa8
RBP: 00007f65197e5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f65197e6038 R14: 00007ffc5d3173e0 R15: 00007ffc5d3174c8
sched: RT throttling activated