INFO: rcu detected stall in blkdev

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
linux-6.1	INFO: rcu detected stall in blkdev_close (2)	1				2	266d	298d	0/3	auto-obsoleted due to no activity on 2026/02/13 16:38
linux-6.1	INFO: rcu detected stall in blkdev_close	1				1	992d	992d	0/3	auto-obsoleted due to no activity on 2024/02/18 02:43
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P4279/1:b..l P4158/1:b..l
	(detected by 0, t=10502 jiffies, g=9297, q=164)
task:udevd           state:R  running task     stack:22624 pid: 4158 ppid:  3545 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5027 [inline]
 __schedule+0x12c4/0x45b0 kernel/sched/core.c:6373
 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6777
 irqentry_exit+0x53/0x80 kernel/entry/common.c:432
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:xas_move_index lib/xarray.c:156 [inline]
RIP: 0010:xas_advance lib/xarray.c:163 [inline]
RIP: 0010:xas_find+0x6b0/0xaa0 lib/xarray.c:1275
Code: e8 b5 41 8f fd 49 8b 6d 00 48 89 e8 48 c1 e8 03 42 0f b6 04 30 84 c0 0f 85 f0 01 00 00 44 0f b6 f3 0f b6 5d 00 bf 40 00 00 00 <89> de e8 89 5b 45 fd 83 fb 3f 0f 87 06 02 00 00 e8 1b 59 45 fd 48
RSP: 0018:ffffc90002cef848 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888024e25901
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000040
RBP: ffff88805f777700 R08: ffffffff843b2b8d R09: ffffffff843b26ac
R10: 0000000000000002 R11: ffff888024e25940 R12: 1ffff9200059df2d
R13: ffffc90002cef978 R14: 0000000000000037 R15: 1ffff9200059df2f
 find_get_entry mm/filemap.c:1978 [inline]
 find_lock_entries+0x22a/0x1030 mm/filemap.c:2092
 truncate_inode_pages_range+0x1c9/0x1290 mm/truncate.c:320
 kill_bdev block/bdev.c:77 [inline]
 blkdev_flush_mapping+0x182/0x340 block/bdev.c:659
 blkdev_put_whole block/bdev.c:690 [inline]
 blkdev_put+0x4f1/0x790 block/bdev.c:954
 blkdev_close+0x7c/0xa0 block/fops.c:475
 __fput+0x3fe/0x8e0 fs/file_table.c:280
 task_work_run+0x129/0x1a0 kernel/task_work.c:188
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0x106/0x130 kernel/entry/common.c:181
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x5d/0x240 kernel/entry/common.c:307
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7eff3f7d00a8
RSP: 002b:00007ffefa8b1fb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 00007eff3f6a4ae0 RCX: 00007eff3f7d00a8
RDX: 00005586bff7d56a RSI: 00007ffefa8b17b8 RDI: 0000000000000008
RBP: 00005583e7c73500 R08: 0000000000000006 R09: e7e8d7434bb57b7d
R10: 000000000000010f R11: 0000000000000246 R12: 0000000000000002
R13: 00005583e7c61060 R14: 0000000000000008 R15: 00005583e7c50910
 </TASK>
task:kworker/u4:8    state:R  running task     stack:21672 pid: 4279 ppid:     2 flags:0x00004000
Workqueue: bat_events batadv_nc_worker
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5027 [inline]
 __schedule+0x12c4/0x45b0 kernel/sched/core.c:6373
 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6777
 irqentry_exit+0x53/0x80 kernel/entry/common.c:432
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:lock_acquire+0x252/0x4f0 kernel/locking/lockdep.c:5627
Code: 2b 00 74 08 4c 89 f7 e8 9c 9e 67 00 f6 44 24 61 02 0f 85 84 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25
RSP: 0018:ffffc900030afa20 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff92000615f50 RCX: 1ffff92000615ef0
RDX: dffffc0000000000 RSI: ffffffff8aab3e20 RDI: ffffffff8af9f2c0
RBP: ffffc900030afb70 R08: dffffc0000000000 R09: fffffbfff2131821
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff92000615f4c
R13: dffffc0000000000 R14: ffffc900030afa80 R15: 0000000000000246
 rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:312
 rcu_read_lock include/linux/rcupdate.h:739 [inline]
 batadv_nc_process_nc_paths+0xb8/0x350 net/batman-adv/network-coding.c:691
 batadv_nc_worker+0x3d4/0x5b0 net/batman-adv/network-coding.c:732
 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310
 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457
 kthread+0x3f6/0x4f0 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
rcu: rcu_preempt kthread starved for 10560 jiffies! g9297 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:26144 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5027 [inline]
 __schedule+0x12c4/0x45b0 kernel/sched/core.c:6373
 schedule+0x11b/0x1f0 kernel/sched/core.c:6456
 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1914
 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:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 5595 Comm: syz.1.339 Not tainted 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline]
RIP: 0010:cpumask_test_cpu include/linux/cpumask.h:344 [inline]
RIP: 0010:cpu_online include/linux/cpumask.h:895 [inline]
RIP: 0010:trace_lock_release include/trace/events/lock.h:58 [inline]
RIP: 0010:lock_release+0x93/0x9a0 kernel/locking/lockdep.c:5634
Code: 4b 89 04 3c 48 b8 f2 f2 00 f3 f3 f3 f3 f3 4b 89 44 3c 08 0f 1f 44 00 00 65 8b 1d 90 21 9f 7e 83 fb 08 0f 83 d3 05 00 00 89 d8 <c1> e8 06 48 8d 3c c5 68 87 0a 8e be 08 00 00 00 e8 98 7b 67 00 89
RSP: 0018:ffffc90000dd0c40 EFLAGS: 00000097
RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffffff816389a2
RDX: dffffc0000000000 RSI: ffffffff81703069 RDI: ffffffff8cb323c8
RBP: ffffc90000dd0d70 R08: dffffc0000000000 R09: fffffbfff2131822
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff920001ba194
R13: ffffffff81703069 R14: ffffc90000dd0da0 R15: dffffc0000000000
FS:  00007f765564b6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000040000006b000 CR3: 0000000023251000 CR4: 00000000003526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 seqcount_lockdep_reader_access+0x10b/0x220 include/linux/seqlock.h:104
 timekeeping_get_delta kernel/time/timekeeping.c:254 [inline]
 timekeeping_get_ns kernel/time/timekeeping.c:388 [inline]
 ktime_get_update_offsets_now+0x89/0x420 kernel/time/timekeeping.c:2303
 hrtimer_update_base kernel/time/hrtimer.c:631 [inline]
 hrtimer_interrupt+0x12f/0x980 kernel/time/hrtimer.c:1796
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
 __sysvec_apic_timer_interrupt+0x13b/0x4b0 arch/x86/kernel/apic/apic.c:1114
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
Code: 31 61 f6 ff 90 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 0e 05 1a f7 48 89 df e8 66 59 1b f7 e8 b1 15 3e f7 fb bf 01 00 00 00 <e8> 66 9e 0e f7 65 8b 05 77 81 b9 75 85 c0 74 02 5b c3 e8 44 9e b7
RSP: 0018:ffffc9000411fbc0 EFLAGS: 00000282
RAX: 44f879e43d2a6500 RBX: ffff888074cae5c0 RCX: ffffffff96a92f03
RDX: dffffc0000000000 RSI: ffffffff8aab2b80 RDI: 0000000000000001
RBP: 0000000000000000 R08: ffffffff81870420 R09: ffffed100e995cb9
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000021
R13: dffffc0000000000 R14: ffff888074caea58 R15: ffff888074cae5c0
 spin_unlock_irq include/linux/spinlock.h:413 [inline]
 get_signal+0x13ee/0x14e0 kernel/signal.c:2903
 arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:178
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x5d/0x240 kernel/entry/common.c:307
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f76577e1de7
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:00007f765564b0e8 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007f76579fafa8 RCX: 00007f76577e1de9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f76579fafa8
RBP: 00007f76579fafa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f76579fafac
R13: 0000000000000000 R14: 00007fff550cd360 R15: 00007fff550cd448
 </TASK>