INFO: rcu detected stall in sys_mount

Status: auto-obsoleted due to no activity on 2025/03/22 20:11
Reported-by: syzbot+47cee05a30e3c83d3d1f@syzkaller.appspotmail.com
First crash: 668d, last: 606d
▶ ▼ Similar bugs (12)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.6 INFO: rcu detected stall in mount 1 1 11d 11d 0/2 upstream: reported on 2026/07/31 02:07
upstream INFO: rcu detected stall in sys_mount (8) prio:low overlayfs 1 syz, C error 43 8h44m 349d 0/29 upstream: reported C repro on 2025/08/27 13:07
upstream INFO: rcu detected stall in sys_mount (6) ntfs 1 syz, C inconclusive 82 1005d 1778d 0/29 auto-obsoleted due to no activity on 2024/02/18 04:52
upstream INFO: rcu detected stall in sys_mount (4) fs 1 2 2350d 2366d 0/29 auto-closed as invalid on 2020/06/02 15:48
upstream INFO: rcu detected stall in sys_mount (5) afs 1 syz, C done done 10 2140d 2162d 15/29 fixed on 2020/11/16 12:12
upstream INFO: rcu detected stall in sys_mount (3) mm 1 6 2442d 2443d 0/29 closed as invalid on 2019/12/04 14:04
upstream INFO: rcu detected stall in sys_mount nfs 1 1 2848d 2848d 0/29 closed as invalid on 2018/10/29 13:47
upstream INFO: rcu detected stall in sys_mount (7) fs 1 syz, C inconclusive done 41 595d 837d 0/29 auto-obsoleted due to no activity on 2025/03/30 13:11
upstream INFO: rcu detected stall in sys_mount (2) exfat 1 1 2799d 2798d 0/29 closed as dup on 2018/12/12 21:01
linux-5.15 INFO: rcu detected stall in mount origin:lts-only 1 syz, C error 5 78d 462d 0/3 upstream: reported C repro on 2025/05/05 20:18
linux-6.1 INFO: rcu detected stall in sys_mount origin:lts-only 1 syz, C inconclusive 8 47d 604d 0/3 upstream: reported C repro on 2024/12/14 21:36
android-5-15 BUG: soft lockup in sys_mount origin:lts 1 syz, C error 17 767d 845d 0/2 auto-obsoleted due to no activity on 2024/10/17 05:03

Sample crash report:
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=9b7/1/0x4000000000000000 softirq=71973/71974 fqs=1 
	(detected by 1, t=10506 jiffies, g=88173, q=395)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 23497 Comm: syz.1.3867 Not tainted 5.15.173-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:__lock_acquire+0xc97/0x1ff0 kernel/locking/lockdep.c:4966
Code: 08 ba 06 00 00 00 e8 78 5d 00 00 31 f6 85 c0 0f 84 c5 08 00 00 48 89 ef 48 8b 5c 24 08 48 89 de ba 08 00 00 00 e8 59 5d 00 00 <31> f6 85 c0 0f 84 a6 08 00 00 48 c7 c0 c0 ef a8 96 48 c1 e8 03 48
RSP: 0018:ffffc90000007a60 EFLAGS: 00000086
RAX: 0000000000000001 RBX: ffff88802ba26480 RCX: ffffffff81632d68
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff90988320
RBP: ffff88802ba25940 R08: dffffc0000000000 R09: fffffbfff2131065
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000002
R13: ffff88802ba26428 R14: 1ffff11005744c94 R15: ffff88802ba264a0
FS:  00007f5b6bfa06c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5b6e1bfd49 CR3: 0000000046c14000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000007e17 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:363 [inline]
 advance_sched+0x47/0x940 net/sched/sch_taprio.c:716
 __run_hrtimer kernel/time/hrtimer.c:1688 [inline]
 __hrtimer_run_queues+0x598/0xcf0 kernel/time/hrtimer.c:1752
 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1814
 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:console_unlock+0xe53/0x12b0 kernel/printk/printk.c:2749
Code: 00 48 83 7c 24 18 00 75 19 e8 49 06 1a 00 eb 18 e8 42 06 1a 00 e8 7d 31 d8 08 48 83 7c 24 18 00 74 e7 e8 30 06 1a 00 fb 31 ff <44> 89 f6 e8 85 09 1a 00 31 db 45 85 f6 0f 95 c0 89 c1 0a 4c 24 17
RSP: 0018:ffffc90003abf4a0 EFLAGS: 00000246
RAX: ffffffff81666d70 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc900033a1000 RSI: 000000000000f6d7 RDI: 0000000000000000
RBP: ffffc90003abf730 R08: ffffffff81666d3b R09: fffffbfff2131021
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffffffff1a8e432
R13: ffffffff8d4721c8 R14: 0000000000000000 R15: dffffc0000000000
 vprintk_emit+0xbf/0x150 kernel/printk/printk.c:2274
 _printk+0xd1/0x120 kernel/printk/printk.c:2299
 exfat_msg+0x136/0x180 fs/exfat/misc.c:61
 exfat_load_upcase_table fs/exfat/nls.c:702 [inline]
 exfat_create_upcase_table+0xcbe/0xfa0 fs/exfat/nls.c:784
 __exfat_fill_super fs/exfat/super.c:588 [inline]
 exfat_fill_super+0x1249/0x2d70 fs/exfat/super.c:644
 get_tree_bdev+0x3fe/0x620 fs/super.c:1325
 vfs_get_tree+0x88/0x270 fs/super.c:1530
 do_new_mount+0x2ba/0xb40 fs/namespace.c:3012
 do_mount fs/namespace.c:3355 [inline]
 __do_sys_mount fs/namespace.c:3563 [inline]
 __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3540
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f5b6e1314ba
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5b6bf9fe68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f5b6bf9fef0 RCX: 00007f5b6e1314ba
RDX: 0000000020006c00 RSI: 0000000020001b40 RDI: 00007f5b6bf9feb0
RBP: 0000000020006c00 R08: 00007f5b6bf9fef0 R09: 00000000208008de
R10: 00000000208008de R11: 0000000000000246 R12: 0000000020001b40
R13: 00007f5b6bf9feb0 R14: 0000000000001507 R15: 0000000020000040
 </TASK>
rcu: rcu_preempt kthread starved for 10500 jiffies! g88173 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:26552 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:
NMI backtrace for cpu 1
CPU: 1 PID: 23499 Comm: syz.5.3869 Not tainted 5.15.173-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline]
 rcu_check_gp_kthread_starvation+0x1d2/0x240 kernel/rcu/tree_stall.h:487
 print_other_cpu_stall+0x137a/0x14d0 kernel/rcu/tree_stall.h:592
 check_cpu_stall kernel/rcu/tree_stall.h:745 [inline]
 rcu_pending kernel/rcu/tree.c:3932 [inline]
 rcu_sched_clock_irq+0xa38/0x1150 kernel/rcu/tree.c:2619
 update_process_times+0x196/0x200 kernel/time/timer.c:1818
 tick_sched_handle kernel/time/tick-sched.c:254 [inline]
 tick_sched_timer+0x386/0x550 kernel/time/tick-sched.c:1473
 __run_hrtimer kernel/time/hrtimer.c:1688 [inline]
 __hrtimer_run_queues+0x55b/0xcf0 kernel/time/hrtimer.c:1752
 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1814
 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:csd_lock_wait kernel/smp.c:440 [inline]
RIP: 0010:smp_call_function_many_cond+0xa93/0xd90 kernel/smp.c:969
Code: 04 03 84 c0 0f 85 84 00 00 00 45 8b 7d 00 44 89 fe 83 e6 01 31 ff e8 4c d5 0b 00 41 83 e7 01 75 07 e8 e1 d1 0b 00 eb 41 f3 90 <48> b8 00 00 00 00 00 fc ff df 0f b6 04 03 84 c0 75 11 41 f7 45 00
RSP: 0018:ffffc90002e5f400 EFLAGS: 00000246
RAX: ffffffff8174a1e4 RBX: 1ffff110171c8541 RCX: 0000000000080000
RDX: ffffc90004b01000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc90002e5f540 R08: ffffffff8174a1b4 R09: fffffbfff2131021
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: ffff8880b8e42a08 R14: ffff8880b8f3b380 R15: 0000000000000001
 on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1135
 on_each_cpu include/linux/smp.h:71 [inline]
 text_poke_sync arch/x86/kernel/alternative.c:1207 [inline]
 text_poke_bp_batch+0x2b4/0x930 arch/x86/kernel/alternative.c:1407
 text_poke_flush arch/x86/kernel/alternative.c:1598 [inline]
 text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1605
 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
 __sched_core_enable kernel/sched/core.c:307 [inline]
 sched_core_get+0x71/0x1d0 kernel/sched/core.c:331
 sched_core_alloc_cookie+0x71/0xa0 kernel/sched/core_sched.c:21
 sched_core_share_pid+0x30d/0x740 kernel/sched/core_sched.c:178
 __do_sys_prctl kernel/sys.c:2564 [inline]
 __se_sys_prctl+0x230/0x2ab0 kernel/sys.c:2298
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f3b479afd19
Code: 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 01 48
RSP: 002b:00007f3b45820038 EFLAGS: 00000246 ORIG_RAX: 000000000000009d
RAX: ffffffffffffffda RBX: 00007f3b47b9ffa0 RCX: 00007f3b479afd19
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 000000000000003e
RBP: 00007f3b47a2ba20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f3b47b9ffa0 R15: 00007fff0e4240a8
 </TASK>
watchdog: BUG: soft lockup - CPU#1 stuck for 263s! [syz.5.3869:23499]
Modules linked in:
irq event stamp: 235782
hardirqs last  enabled at (235781): [<ffffffff8a600d06>] asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
hardirqs last disabled at (235782): [<ffffffff8a3e923a>] sysvec_apic_timer_interrupt+0xa/0xc0 arch/x86/kernel/apic/apic.c:1108
softirqs last  enabled at (7846): [<ffffffff814d9907>] __do_softirq kernel/softirq.c:592 [inline]
softirqs last  enabled at (7846): [<ffffffff814d9907>] invoke_softirq kernel/softirq.c:432 [inline]
softirqs last  enabled at (7846): [<ffffffff814d9907>] __irq_exit_rcu+0x157/0x240 kernel/softirq.c:641
softirqs last disabled at (7823): [<ffffffff814d9907>] __do_softirq kernel/softirq.c:592 [inline]
softirqs last disabled at (7823): [<ffffffff814d9907>] invoke_softirq kernel/softirq.c:432 [inline]
softirqs last disabled at (7823): [<ffffffff814d9907>] __irq_exit_rcu+0x157/0x240 kernel/softirq.c:641
CPU: 1 PID: 23499 Comm: syz.5.3869 Not tainted 5.15.173-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:csd_lock_wait kernel/smp.c:440 [inline]
RIP: 0010:smp_call_function_many_cond+0xa93/0xd90 kernel/smp.c:969
Code: 04 03 84 c0 0f 85 84 00 00 00 45 8b 7d 00 44 89 fe 83 e6 01 31 ff e8 4c d5 0b 00 41 83 e7 01 75 07 e8 e1 d1 0b 00 eb 41 f3 90 <48> b8 00 00 00 00 00 fc ff df 0f b6 04 03 84 c0 75 11 41 f7 45 00
RSP: 0018:ffffc90002e5f400 EFLAGS: 00000246
RAX: ffffffff8174a1e4 RBX: 1ffff110171c8541 RCX: 0000000000080000
RDX: ffffc90004b01000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc90002e5f540 R08: ffffffff8174a1b4 R09: fffffbfff2131021
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: ffff8880b8e42a08 R14: ffff8880b8f3b380 R15: 0000000000000001
FS:  00007f3b458206c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000004b429000 CR4: 00000000003526e0
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1135
 on_each_cpu include/linux/smp.h:71 [inline]
 text_poke_sync arch/x86/kernel/alternative.c:1207 [inline]
 text_poke_bp_batch+0x2b4/0x930 arch/x86/kernel/alternative.c:1407
 text_poke_flush arch/x86/kernel/alternative.c:1598 [inline]
 text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1605
 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
 __sched_core_enable kernel/sched/core.c:307 [inline]
 sched_core_get+0x71/0x1d0 kernel/sched/core.c:331
 sched_core_alloc_cookie+0x71/0xa0 kernel/sched/core_sched.c:21
 sched_core_share_pid+0x30d/0x740 kernel/sched/core_sched.c:178
 __do_sys_prctl kernel/sys.c:2564 [inline]
 __se_sys_prctl+0x230/0x2ab0 kernel/sys.c:2298
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f3b479afd19
Code: 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 01 48
RSP: 002b:00007f3b45820038 EFLAGS: 00000246 ORIG_RAX: 000000000000009d
RAX: ffffffffffffffda RBX: 00007f3b47b9ffa0 RCX: 00007f3b479afd19
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 000000000000003e
RBP: 00007f3b47a2ba20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f3b47b9ffa0 R15: 00007fff0e4240a8
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 23497 Comm: syz.1.3867 Not tainted 5.15.173-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:__lock_acquire+0x417/0x1ff0 kernel/locking/lockdep.c:4952
Code: 00 00 31 c0 83 3f 00 0f 95 c0 09 c3 c1 e3 0d 44 09 e3 8b 44 24 60 c1 e0 0f 0f b7 c0 09 d8 8b 74 24 54 83 e6 03 c1 e6 10 09 c6 <8b> 44 24 2c 83 e0 01 c1 e0 12 31 c9 83 7c 24 70 00 0f 95 c1 c1 e1
RSP: 0018:ffffc90000007a60 EFLAGS: 00000002
RAX: 0000000000004015 RBX: 0000000000004015 RCX: ffff88802ba26414
RDX: dffffc0000000000 RSI: 0000000000024015 RDI: ffff88802ba26414
RBP: ffff88802ba25940 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000015
R13: 000000000000000a R14: 1ffff11005744c94 R15: 0000000000000000
FS:  00007f5b6bfa06c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5b6e1bfd49 CR3: 0000000046c14000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000007e17 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
 rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:312
 rcu_read_lock include/linux/rcupdate.h:739 [inline]
 advance_sched+0x6ce/0x940 net/sched/sch_taprio.c:769
 __run_hrtimer kernel/time/hrtimer.c:1688 [inline]
 __hrtimer_run_queues+0x598/0xcf0 kernel/time/hrtimer.c:1752
 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1814
 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:console_unlock+0xe53/0x12b0 kernel/printk/printk.c:2749
Code: 00 48 83 7c 24 18 00 75 19 e8 49 06 1a 00 eb 18 e8 42 06 1a 00 e8 7d 31 d8 08 48 83 7c 24 18 00 74 e7 e8 30 06 1a 00 fb 31 ff <44> 89 f6 e8 85 09 1a 00 31 db 45 85 f6 0f 95 c0 89 c1 0a 4c 24 17
RSP: 0018:ffffc90003abf4a0 EFLAGS: 00000246
RAX: ffffffff81666d70 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc900033a1000 RSI: 000000000000f6d7 RDI: 0000000000000000
RBP: ffffc90003abf730 R08: ffffffff81666d3b R09: fffffbfff2131021
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffffffff1a8e432
R13: ffffffff8d4721c8 R14: 0000000000000000 R15: dffffc0000000000
 vprintk_emit+0xbf/0x150 kernel/printk/printk.c:2274
 _printk+0xd1/0x120 kernel/printk/printk.c:2299
 exfat_msg+0x136/0x180 fs/exfat/misc.c:61
 exfat_load_upcase_table fs/exfat/nls.c:702 [inline]
 exfat_create_upcase_table+0xcbe/0xfa0 fs/exfat/nls.c:784
 __exfat_fill_super fs/exfat/super.c:588 [inline]
 exfat_fill_super+0x1249/0x2d70 fs/exfat/super.c:644
 get_tree_bdev+0x3fe/0x620 fs/super.c:1325
 vfs_get_tree+0x88/0x270 fs/super.c:1530
 do_new_mount+0x2ba/0xb40 fs/namespace.c:3012
 do_mount fs/namespace.c:3355 [inline]
 __do_sys_mount fs/namespace.c:3563 [inline]
 __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3540
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f5b6e1314ba
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5b6bf9fe68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f5b6bf9fef0 RCX: 00007f5b6e1314ba
RDX: 0000000020006c00 RSI: 0000000020001b40 RDI: 00007f5b6bf9feb0
RBP: 0000000020006c00 R08: 00007f5b6bf9fef0 R09: 00000000208008de
R10: 00000000208008de R11: 0000000000000246 R12: 0000000020001b40
R13: 00007f5b6bf9feb0 R14: 0000000000001507 R15: 0000000020000040
 </TASK>

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/12/12 20:11 linux-5.15.y 0a51d2d4527b 530e80f8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in sys_mount
2024/10/11 22:20 linux-5.15.y 3a5928702e71 084d8178 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in sys_mount
* Struck through repros no longer work on HEAD.