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INFO: rcu detected stall in sys_clock_settime

Status: upstream: reported C repro on 2023/04/11 17:25
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+b416cb5da4c449ea0d75@syzkaller.appspotmail.com
First crash: 1110d, last: 4d12h
Fix commit to backport (bisect log) :
tree: upstream
commit e634134180885574d1fe7aa162777ba41e7fcd5b
Author: Vladimir Oltean <vladimir.oltean@nxp.com>
Date: Mon May 27 15:39:54 2024 +0000

  net/sched: taprio: make q->picos_per_byte available to fill_sched_entry()

  
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2025/03/13 linux-6.1.y (ToT) 6ae7ac5c4251 C [report] INFO: rcu detected stall in batadv_iv_send_outstanding_bat_ogm_packet
2025/03/13 upstream (ToT) b7f94fcf5546 C Didn't crash
▶ ▼ Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.6 INFO: rcu detected stall in sys_clock_settime 1 1 137d 137d 0/2 auto-obsoleted due to no activity on 2026/03/19 03:29
linux-5.15 INFO: rcu detected stall in sys_clock_settime 1 43 108d 1017d 0/3 auto-obsoleted due to no activity on 2026/04/17 23:52
upstream INFO: rcu detected stall in sys_clock_settime kernel 1 C done inconclusive 505 4d17h 2113d 0/29 upstream: reported C repro on 2020/07/12 17:54
▶ ▼ Fix bisection attempts (1)
Created Duration User Patch Repo Result
2025/03/25 18:51 6h57m fix candidate upstream OK (1) job log

Sample crash report:
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=c37c/1/0x4000000000000000 softirq=7653/7662 fqs=2
	(detected by 1, t=10505 jiffies, g=6017, q=19 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4273 Comm: syz-executor312 Not tainted 6.1.128-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:84 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:102 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x71/0x290 mm/kasan/generic.c:189
Code: 54 37 ff 49 c1 ea 03 49 bb 01 00 00 00 00 fc ff df 4f 8d 34 1a 4c 89 f5 4c 29 cd 48 83 fd 10 7f 26 48 85 ed 0f 84 3a 01 00 00 <49> f7 d2 49 01 da 41 80 39 00 0f 85 c4 01 00 00 49 ff c1 49 ff c2
RSP: 0018:ffffc900000079b8 EFLAGS: 00000002
RAX: 0000000000000001 RBX: 1ffffffff224a04c RCX: ffffffff816ab9f0
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff91250260
RBP: 0000000000000001 R08: dffffc0000000000 R09: fffffbfff224a04c
R10: 1ffffffff224a04c R11: dffffc0000000001 R12: ffff88807e094658
R13: ffff88807e093b80 R14: fffffbfff224a04d R15: 1ffff1100fc128da
FS:  00007f85e520e6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f85e520ed58 CR3: 0000000079c44000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 instrument_atomic_read include/linux/instrumented.h:72 [inline]
 _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
 hlock_class kernel/locking/lockdep.c:228 [inline]
 __lock_acquire+0x11d0/0x1f80 kernel/locking/lockdep.c:5046
 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_activate+0x68/0x4e0 lib/debugobjects.c:698
 debug_hrtimer_activate kernel/time/hrtimer.c:421 [inline]
 debug_activate kernel/time/hrtimer.c:476 [inline]
 enqueue_hrtimer+0x30/0x410 kernel/time/hrtimer.c:1085
 __run_hrtimer kernel/time/hrtimer.c:1706 [inline]
 __hrtimer_run_queues+0x728/0xe50 kernel/time/hrtimer.c:1753
 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1815
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
 __sysvec_apic_timer_interrupt+0x158/0x5b0 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
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xd4/0x130 kernel/locking/spinlock.c:194
Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 02 f0 24 f7 f6 44 24 21 02 75 4e 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> f7 4f a1 f6 65 8b 05 98 2f 45 75 85 c0 74 3f 48 c7 04 24 0e 36
RSP: 0018:ffffc90003d87b60 EFLAGS: 00000206
RAX: 5d95b859b15f7b00 RBX: 1ffff920007b0f70 RCX: ffffffff816b127a
RDX: dffffc0000000000 RSI: ffffffff8b0c0340 RDI: 0000000000000001
RBP: ffffc90003d87bf0 R08: dffffc0000000000 R09: fffffbfff224a04d
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: 1ffff920007b0f6c R14: ffffc90003d87b80 R15: 0000000000000246
 clock_was_set+0x177/0x900 kernel/time/hrtimer.c:971
 do_settimeofday64+0x673/0x7e0 kernel/time/timekeeping.c:1345
 __do_sys_clock_settime kernel/time/posix-timers.c:1124 [inline]
 __se_sys_clock_settime kernel/time/posix-timers.c:1112 [inline]
 __x64_sys_clock_settime+0x232/0x270 kernel/time/posix-timers.c:1112
 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: 0033:0x7f85e527ee99
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 1f 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f85e520e168 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3
RAX: ffffffffffffffda RBX: 00007f85e53081f8 RCX: 00007f85e527ee99
RDX: 00007f85e5257966 RSI: 0000400000000080 RDI: 0000000000000000
RBP: 00007f85e53081f0 R08: 00007fffde5d7367 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f85e53081fc
R13: 000000000000006e R14: 00007fffde5d7280 R15: 00007fffde5d7368
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.591 msecs
rcu: rcu_preempt kthread timer wakeup didn't happen for 10494 jiffies! g6017 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=2376
rcu: rcu_preempt kthread starved for 10495 jiffies! g6017 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27256 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x143f/0x4570 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:295
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 PID: 46 Comm: kworker/u4:3 Not tainted 6.1.128-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:424 [inline]
RIP: 0010:smp_call_function_many_cond+0x1fae/0x3460 kernel/smp.c:998
Code: 2f 44 89 ee 83 e6 01 31 ff e8 0e 44 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 0a e8 99 40 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:ffffc90000b775a0 EFLAGS: 00000293
RAX: ffffffff817f5c29 RBX: 1ffff110171c8595 RCX: ffff88801fa81dc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000b77980 R08: ffffffff817f5bf2 R09: fffffbfff224a04d
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000800000000
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8880b8e42ca8
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555574a4fda8 CR3: 000000000d08e000 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+0x2bb/0x940 arch/x86/kernel/alternative.c:1534
 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:207
 static_key_enable+0x16/0x20 kernel/jump_label.c:220
 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:295
 </TASK>

Crashes (49):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/02/11 10:49 linux-6.1.y 0cbb5f65e52f 43f51a00 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2026/04/21 12:00 linux-6.1.y 7c87defbd336 3f2e655b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2026/04/16 21:14 linux-6.1.y 8e8fc038cad5 4743f87d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2025/12/25 02:53 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2025/11/05 08:27 linux-6.1.y f6e38ae624cf a6c9c731 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2025/08/14 15:57 linux-6.1.y 3594f306da12 5d8c2ac2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2025/08/11 00:40 linux-6.1.y 3594f306da12 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2025/07/22 16:12 linux-6.1.y 3369c6df2fae 8e9d1dc1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2025/07/09 09:54 linux-6.1.y 04d1ccaa9c28 f4e5e155 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2025/06/28 00:40 linux-6.1.y 7e69c33e4858 fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2025/06/23 01:01 linux-6.1.y 58485ff1a74f d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2025/05/24 11:34 linux-6.1.y da3c5173c55f ed351ea7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2025/05/06 00:15 linux-6.1.y ac7079a42ea5 6ca47dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2025/03/12 21:27 linux-6.1.y 6ae7ac5c4251 1a5d9317 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2025/01/28 00:15 linux-6.1.y 75cefdf153f5 18070896 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2024/12/31 23:37 linux-6.1.y 563edd786f0a d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2024/12/17 16:42 linux-6.1.y 52f863f820fd f93b2b55 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2024/11/25 21:47 linux-6.1.y e4d90d63d385 11dbc254 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2024/09/19 08:10 linux-6.1.y e526b12bf916 c673ca06 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2024/09/08 17:59 linux-6.1.y 5ca5b389fddf 9750182a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2024/08/25 16:59 linux-6.1.y ee5e09825b81 d7d32352 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2024/08/11 16:02 linux-6.1.y 36790ef5e00b 6f4edef4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2024/08/06 20:58 linux-6.1.y 48d525b0e463 1ef9fe42 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2024/07/17 10:27 linux-6.1.y cac15753b8ce 215bec2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2024/06/06 14:05 linux-6.1.y 88690811da69 121701b6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2024/04/20 13:24 linux-6.1.y 6741e066ec76 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2024/04/07 14:42 linux-6.1.y 347385861c50 ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2024/04/07 06:41 linux-6.1.y 347385861c50 ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2024/03/28 15:19 linux-6.1.y e5cd595e23c1 e91187ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2024/01/24 16:41 linux-6.1.y 8fd7f4462453 1e153dc8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2024/01/18 16:41 linux-6.1.y fec3b1451d5f 239abf84 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2023/12/11 18:07 linux-6.1.y e7cddbb41b63 28b24332 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2023/10/30 14:06 linux-6.1.y 32c9cdbe383c b5729d82 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2023/09/23 19:00 linux-6.1.y d23900f974e0 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2023/08/22 04:55 linux-6.1.y 6c44e13dc284 6b415825 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2023/08/08 16:45 linux-6.1.y 52a953d0934b 9552ae77 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2023/07/26 15:54 linux-6.1.y 5302e81aa209 41fe1bae .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2023/07/20 22:56 linux-6.1.y a456e1743881 f49af159 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2023/07/17 13:59 linux-6.1.y 61fd484b2cf6 20f8b3c2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2023/07/14 22:17 linux-6.1.y 61fd484b2cf6 35d9ecc5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2023/07/13 06:32 linux-6.1.y 61fd484b2cf6 86081196 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2023/07/07 23:29 linux-6.1.y 61fd484b2cf6 668cb1fa .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2023/07/05 23:39 linux-6.1.y 0f4ac6b4c5f0 ba5dba36 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2023/06/30 00:27 linux-6.1.y a1c449d00ff8 01298212 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2023/05/26 11:55 linux-6.1.y a343b0dd87b4 b40ef614 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2023/05/09 08:06 linux-6.1.y ca48fc16c493 c7a5e2a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2023/04/29 02:56 linux-6.1.y ca1c9012c941 62df2017 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2023/04/20 04:03 linux-6.1.y 0102425ac76b a219f34e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
2023/04/11 17:25 linux-6.1.y 543aff194ab6 49faf98d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_clock_settime
* Struck through repros no longer work on HEAD.