syzbot


INFO: rcu detected stall in kernfs_fop_write_iter (2)

Status: upstream: reported on 2024/04/30 16:51
Reported-by: syzbot+6a3035b78ed235eb5e2a@syzkaller.appspotmail.com
First crash: 55d, last: 55d
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 INFO: rcu detected stall in kernfs_fop_write_iter 1 334d 334d 0/3 auto-obsoleted due to no activity on 2023/11/03 22:13

Sample crash report:
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=66ac/1/0x4000000000000000 softirq=17623/17630 fqs=0
	(detected by 1, t=10502 jiffies, g=24793, q=9 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 5692 Comm: syz-executor.4 Not tainted 6.1.89-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4748 [inline]
RIP: 0010:__lock_acquire+0x7af/0x1f80 kernel/locking/lockdep.c:4999
Code: 00 00 e8 b4 96 77 00 48 0f a3 1d 9c 40 df 0e 73 1b 48 8d 04 5b 48 c1 e0 06 48 8d 98 20 11 19 90 48 ba 00 00 00 00 00 fc ff df <eb> 26 48 ba 00 00 00 00 00 fc ff df 48 8b 44 24 50 0f b6 04 10 84
RSP: 0018:ffffc90000007a00 EFLAGS: 00000002
RAX: 0000000000004980 RBX: ffffffff90195aa0 RCX: ffffffff816a717c
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffffffff9049b228
RBP: ffff888021922a00 R08: dffffc0000000000 R09: fffffbfff2093646
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000008
R13: ffff888021922a00 R14: 0000000000000008 R15: 1ffff11004324502
FS:  000055555633e480(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6947203000 CR3: 000000007b90a000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
 debug_object_deactivate+0x63/0x380 lib/debugobjects.c:752
 debug_hrtimer_deactivate kernel/time/hrtimer.c:425 [inline]
 debug_deactivate+0x1d/0x280 kernel/time/hrtimer.c:481
 __run_hrtimer kernel/time/hrtimer.c:1654 [inline]
 __hrtimer_run_queues+0x334/0xe50 kernel/time/hrtimer.c:1750
 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1812
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline]
 __sysvec_apic_timer_interrupt+0x156/0x580 arch/x86/kernel/apic/apic.c:1112
 sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1106
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:653
RIP: 0010:console_emit_next_record+0xd67/0x1000 kernel/printk/printk.c:2786
Code: 2a 1c 00 44 0f b6 74 24 1f 48 83 7c 24 30 00 75 07 e8 6d 2a 1c 00 eb 06 e8 66 2a 1c 00 fb 48 c7 84 24 a0 00 00 00 0e 36 e0 45 <43> c7 04 2c 00 00 00 00 4b c7 44 2c 0a 00 00 00 00 4b c7 44 2c 12
RSP: 0018:ffffc9000f00eb00 EFLAGS: 00000293
RAX: ffffffff816e64fa RBX: ffffffff816e623c RCX: ffff888021921dc0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000f00edb0 R08: ffffffff816e64d2 R09: fffffbfff2093645
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: 1ffff92001e01d74 R14: 0000000000000001 R15: 0000000000000000
 console_unlock+0x278/0x7c0 kernel/printk/printk.c:2906
 vprintk_emit+0x523/0x740 kernel/printk/printk.c:2303
 dev_vprintk_emit+0x2aa/0x323 drivers/base/core.c:4922
 dev_printk_emit+0xd9/0x118 drivers/base/core.c:4933
 __netdev_printk+0x335/0x410 net/core/dev.c:11257
 netdev_info+0x11e/0x165 net/core/dev.c:11312
 nsim_udp_tunnel_unset_port+0x2db/0x540 drivers/net/netdevsim/udp_tunnels.c:64
 udp_tunnel_nic_device_sync_by_port net/ipv4/udp_tunnel_nic.c:246 [inline]
 __udp_tunnel_nic_device_sync+0xa7e/0x13b0 net/ipv4/udp_tunnel_nic.c:289
 udp_tunnel_nic_flush+0x519/0xaa0 net/ipv4/udp_tunnel_nic.c:668
 udp_tunnel_nic_unregister net/ipv4/udp_tunnel_nic.c:869 [inline]
 udp_tunnel_nic_netdevice_event+0xa1a/0x1350 net/ipv4/udp_tunnel_nic.c:909
 notifier_call_chain kernel/notifier.c:87 [inline]
 raw_notifier_call_chain+0xd0/0x170 kernel/notifier.c:455
 call_netdevice_notifiers_info net/core/dev.c:1970 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:2008 [inline]
 call_netdevice_notifiers net/core/dev.c:2022 [inline]
 unregister_netdevice_many+0xec1/0x17a0 net/core/dev.c:10881
 unregister_netdevice_queue+0x2e6/0x350 net/core/dev.c:10812
 unregister_netdevice include/linux/netdevice.h:3045 [inline]
 nsim_destroy+0x44/0x140 drivers/net/netdevsim/netdev.c:382
 __nsim_dev_port_del+0x153/0x1b0 drivers/net/netdevsim/dev.c:1430
 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1442 [inline]
 nsim_dev_reload_destroy+0x286/0x490 drivers/net/netdevsim/dev.c:1659
 nsim_drv_remove+0x5c/0x160 drivers/net/netdevsim/dev.c:1675
 device_remove drivers/base/dd.c:548 [inline]
 __device_release_driver drivers/base/dd.c:1260 [inline]
 device_release_driver_internal+0x4f3/0x880 drivers/base/dd.c:1286
 bus_remove_device+0x2e5/0x400 drivers/base/bus.c:529
 device_del+0x6e2/0xbd0 drivers/base/core.c:3874
 device_unregister+0x1c/0xc0 drivers/base/core.c:3917
 nsim_bus_dev_del drivers/net/netdevsim/bus.c:310 [inline]
 del_device_store+0x35f/0x480 drivers/net/netdevsim/bus.c:219
 kernfs_fop_write_iter+0x3a2/0x4f0 fs/kernfs/file.c:330
 call_write_iter include/linux/fs.h:2265 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x7ae/0xba0 fs/read_write.c:584
 ksys_write+0x19c/0x2c0 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fda1e87cbef
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 b9 80 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 0c 81 02 00 48
RSP: 002b:00007ffd96338940 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007fda1e87cbef
RDX: 0000000000000001 RSI: 00007ffd96338990 RDI: 0000000000000005
RBP: 00007fda1e8ca039 R08: 0000000000000000 R09: 00007ffd96338797
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001
R13: 00007ffd96338990 R14: 00007fda1f4d4620 R15: 0000000000000003
 </TASK>
rcu: rcu_preempt kthread starved for 10502 jiffies! g24793 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:26112 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0x142d/0x4550 kernel/sched/core.c:6558
 schedule+0xbf/0x180 kernel/sched/core.c:6634
 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1965
 rcu_gp_fqs_loop+0x2d2/0x1150 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0xa3/0x3b0 kernel/rcu/tree.c:1905
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 PID: 9 Comm: kworker/u4:0 Not tainted 6.1.89-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:424 [inline]
RIP: 0010:smp_call_function_many_cond+0x1fb0/0x3460 kernel/smp.c:998
Code: 2f 44 89 ee 83 e6 01 31 ff e8 ec 42 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 0a e8 77 3f 0b 00 e9 1b ff ff ff f3 90 <42> 0f b6 04 2b 84 c0 75 14 41 f7 07 01 00 00 00 0f 84 fe fe ff ff
RSP: 0018:ffffc900000e75a0 EFLAGS: 00000293
RAX: ffffffff817f500b RBX: 1ffff1101730859d RCX: ffff88813feb8000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900000e7980 R08: ffffffff817f4fd4 R09: fffffbfff2093645
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000800000000
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8880b9842ce8
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f174c3b1d58 CR3: 000000000ce8e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1166
 on_each_cpu include/linux/smp.h:71 [inline]
 text_poke_sync arch/x86/kernel/alternative.c:1334 [inline]
 text_poke_bp_batch+0x5f9/0x940 arch/x86/kernel/alternative.c:1596
 text_poke_flush arch/x86/kernel/alternative.c:1725 [inline]
 text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1732
 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146
 static_key_enable_cpuslocked+0x12e/0x250 kernel/jump_label.c:177
 static_key_enable+0x16/0x20 kernel/jump_label.c:190
 toggle_allocation_gate+0xbf/0x480 mm/kfence/core.c:804
 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>
watchdog: BUG: soft lockup - CPU#1 stuck for 246s! [kworker/u4:0:9]
Modules linked in:
irq event stamp: 4546998
hardirqs last  enabled at (4546997): [<ffffffff8aa00d46>] asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:653
hardirqs last disabled at (4546998): [<ffffffff8a8a9c6a>] sysvec_apic_timer_interrupt+0xa/0xb0 arch/x86/kernel/apic/apic.c:1106
softirqs last  enabled at (4497076): [<ffffffff81542035>] invoke_softirq kernel/softirq.c:445 [inline]
softirqs last  enabled at (4497076): [<ffffffff81542035>] __irq_exit_rcu+0x155/0x240 kernel/softirq.c:650
softirqs last disabled at (4497029): [<ffffffff81542035>] invoke_softirq kernel/softirq.c:445 [inline]
softirqs last disabled at (4497029): [<ffffffff81542035>] __irq_exit_rcu+0x155/0x240 kernel/softirq.c:650
CPU: 1 PID: 9 Comm: kworker/u4:0 Not tainted 6.1.89-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:424 [inline]
RIP: 0010:smp_call_function_many_cond+0x1fb0/0x3460 kernel/smp.c:998
Code: 2f 44 89 ee 83 e6 01 31 ff e8 ec 42 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 0a e8 77 3f 0b 00 e9 1b ff ff ff f3 90 <42> 0f b6 04 2b 84 c0 75 14 41 f7 07 01 00 00 00 0f 84 fe fe ff ff
RSP: 0018:ffffc900000e75a0 EFLAGS: 00000293
RAX: ffffffff817f500b RBX: 1ffff1101730859d RCX: ffff88813feb8000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900000e7980 R08: ffffffff817f4fd4 R09: fffffbfff2093645
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000800000000
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8880b9842ce8
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f174c3b1d58 CR3: 000000000ce8e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1166
 on_each_cpu include/linux/smp.h:71 [inline]
 text_poke_sync arch/x86/kernel/alternative.c:1334 [inline]
 text_poke_bp_batch+0x5f9/0x940 arch/x86/kernel/alternative.c:1596
 text_poke_flush arch/x86/kernel/alternative.c:1725 [inline]
 text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1732
 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146
 static_key_enable_cpuslocked+0x12e/0x250 kernel/jump_label.c:177
 static_key_enable+0x16/0x20 kernel/jump_label.c:190
 toggle_allocation_gate+0xbf/0x480 mm/kfence/core.c:804
 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 5692 Comm: syz-executor.4 Not tainted 6.1.89-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:lock_release+0x6d/0xa20 kernel/locking/lockdep.c:5670
Code: 41 48 c7 44 24 68 15 08 8f 8c 48 c7 44 24 70 70 89 6a 81 4c 8d 64 24 60 49 c1 ec 03 48 b8 f1 f1 f1 f1 04 f2 00 f2 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
RSP: 0018:ffffc90000007b60 EFLAGS: 00000806
RAX: f200f204f1f1f1f1 RBX: ffff88801aba22e8 RCX: ffffffff88b4a560
RDX: 0000000000000001 RSI: ffffffff88b4a5ab RDI: ffff88801aba2300
RBP: ffffc90000007ca0 R08: dffffc0000000000 R09: ffffed100b3b6805
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff92000000f78
R13: ffffffff88b4a5ab R14: dffffc0000000000 R15: dffffc0000000000
FS:  000055555633e480(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6947203000 CR3: 000000007b90a000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 __raw_spin_unlock include/linux/spinlock_api_smp.h:141 [inline]
 _raw_spin_unlock+0x12/0x40 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 advance_sched+0x68b/0x970 net/sched/sch_taprio.c:749
 __run_hrtimer kernel/time/hrtimer.c:1686 [inline]
 __hrtimer_run_queues+0x5e5/0xe50 kernel/time/hrtimer.c:1750
 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1812
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline]
 __sysvec_apic_timer_interrupt+0x156/0x580 arch/x86/kernel/apic/apic.c:1112
 sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1106
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:653
RIP: 0010:console_emit_next_record+0xd67/0x1000 kernel/printk/printk.c:2786
Code: 2a 1c 00 44 0f b6 74 24 1f 48 83 7c 24 30 00 75 07 e8 6d 2a 1c 00 eb 06 e8 66 2a 1c 00 fb 48 c7 84 24 a0 00 00 00 0e 36 e0 45 <43> c7 04 2c 00 00 00 00 4b c7 44 2c 0a 00 00 00 00 4b c7 44 2c 12
RSP: 0018:ffffc9000f00eb00 EFLAGS: 00000293
RAX: ffffffff816e64fa RBX: ffffffff816e623c RCX: ffff888021921dc0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000f00edb0 R08: ffffffff816e64d2 R09: fffffbfff2093645
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: 1ffff92001e01d74 R14: 0000000000000001 R15: 0000000000000000
 console_unlock+0x278/0x7c0 kernel/printk/printk.c:2906
 vprintk_emit+0x523/0x740 kernel/printk/printk.c:2303
 dev_vprintk_emit+0x2aa/0x323 drivers/base/core.c:4922
 dev_printk_emit+0xd9/0x118 drivers/base/core.c:4933
 __netdev_printk+0x335/0x410 net/core/dev.c:11257
 netdev_info+0x11e/0x165 net/core/dev.c:11312
 nsim_udp_tunnel_unset_port+0x2db/0x540 drivers/net/netdevsim/udp_tunnels.c:64
 udp_tunnel_nic_device_sync_by_port net/ipv4/udp_tunnel_nic.c:246 [inline]
 __udp_tunnel_nic_device_sync+0xa7e/0x13b0 net/ipv4/udp_tunnel_nic.c:289
 udp_tunnel_nic_flush+0x519/0xaa0 net/ipv4/udp_tunnel_nic.c:668
 udp_tunnel_nic_unregister net/ipv4/udp_tunnel_nic.c:869 [inline]
 udp_tunnel_nic_netdevice_event+0xa1a/0x1350 net/ipv4/udp_tunnel_nic.c:909
 notifier_call_chain kernel/notifier.c:87 [inline]
 raw_notifier_call_chain+0xd0/0x170 kernel/notifier.c:455
 call_netdevice_notifiers_info net/core/dev.c:1970 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:2008 [inline]
 call_netdevice_notifiers net/core/dev.c:2022 [inline]
 unregister_netdevice_many+0xec1/0x17a0 net/core/dev.c:10881
 unregister_netdevice_queue+0x2e6/0x350 net/core/dev.c:10812
 unregister_netdevice include/linux/netdevice.h:3045 [inline]
 nsim_destroy+0x44/0x140 drivers/net/netdevsim/netdev.c:382
 __nsim_dev_port_del+0x153/0x1b0 drivers/net/netdevsim/dev.c:1430
 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1442 [inline]
 nsim_dev_reload_destroy+0x286/0x490 drivers/net/netdevsim/dev.c:1659
 nsim_drv_remove+0x5c/0x160 drivers/net/netdevsim/dev.c:1675
 device_remove drivers/base/dd.c:548 [inline]
 __device_release_driver drivers/base/dd.c:1260 [inline]
 device_release_driver_internal+0x4f3/0x880 drivers/base/dd.c:1286
 bus_remove_device+0x2e5/0x400 drivers/base/bus.c:529
 device_del+0x6e2/0xbd0 drivers/base/core.c:3874
 device_unregister+0x1c/0xc0 drivers/base/core.c:3917
 nsim_bus_dev_del drivers/net/netdevsim/bus.c:310 [inline]
 del_device_store+0x35f/0x480 drivers/net/netdevsim/bus.c:219
 kernfs_fop_write_iter+0x3a2/0x4f0 fs/kernfs/file.c:330
 call_write_iter include/linux/fs.h:2265 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x7ae/0xba0 fs/read_write.c:584
 ksys_write+0x19c/0x2c0 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fda1e87cbef
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 b9 80 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 0c 81 02 00 48
RSP: 002b:00007ffd96338940 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007fda1e87cbef
RDX: 0000000000000001 RSI: 00007ffd96338990 RDI: 0000000000000005
RBP: 00007fda1e8ca039 R08: 0000000000000000 R09: 00007ffd96338797
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001
R13: 00007ffd96338990 R14: 00007fda1f4d4620 R15: 0000000000000003
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/04/30 16:50 linux-6.1.y dcbc050cb0d3 3ce4924c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in kernfs_fop_write_iter
* Struck through repros no longer work on HEAD.