INFO: rcu detected stall in tcp_write_timer

Status: upstream: reported on 2026/03/10 11:19
Reported-by: syzbot+e2f484aebb1ce6cef6be@syzkaller.appspotmail.com
First crash: 248d, last: 14d
▶ ▼ Similar bugs (28)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in tcp_write_timer (2) bpf 1 2 2110d 2165d 0/29 auto-closed as invalid on 2021/05/03 11:59
upstream INFO: rcu detected stall in tcp_write_timer (4) net 1 1 851d 851d 0/29 auto-obsoleted due to no activity on 2024/10/13 08:46
linux-5.15 INFO: rcu detected stall in tcp_write_timer 1 4 760d 812d 0/3 auto-obsoleted due to no activity on 2025/01/22 08:13
upstream INFO: rcu detected stall in tcp_write_timer net 1 3 2659d 2653d 0/29 auto-closed as invalid on 2019/10/25 14:11
linux-5.15 INFO: rcu detected stall in tcp_write_timer (2) 1 2 545d 629d 0/3 auto-obsoleted due to no activity on 2025/08/25 02:13
upstream INFO: rcu detected stall in tcp_write_timer (3) net 1 1 1977d 1977d 0/29 auto-closed as invalid on 2021/09/13 13:17
linux-6.1 INFO: rcu detected stall in tcp_write_timer 1 16 646d 875d 0/3 auto-obsoleted due to no activity on 2025/05/16 12:07
upstream BUG: soft lockup in tcp_write_timer (4) mm 1 4 860d 885d 26/29 fixed on 2024/07/09 19:14
linux-6.1 INFO: rcu detected stall in tcp_write_timer (2) origin:lts-only 1 syz, C 6 4d17h 252d 0/3 upstream: reported C repro on 2026/03/06 03:16
linux-5.15 INFO: rcu detected stall in tcp_write_timer (4) origin:lts-only 1 syz error 7 20d 257d 0/3 upstream: reported syz repro on 2026/03/01 05:59
linux-5.15 INFO: rcu detected stall in tcp_write_timer (3) 1 2 394d 410d 0/3 auto-obsoleted due to no activity on 2026/01/22 20:12
linux-4.14 INFO: rcu detected stall in tcp_write_timer 1 4 2261d 2503d 0/1 auto-closed as invalid on 2021/01/02 05:45
linux-4.19 INFO: rcu detected stall in tcp_write_timer 1 2 2390d 2444d 0/1 auto-closed as invalid on 2020/08/26 06:46
upstream BUG: soft lockup in tcp_write_timer (10) perf mm net 1 3 246d 276d 0/29 closed as invalid on 2026/03/27 01:43
linux-4.19 BUG: soft lockup in tcp_write_timer (3) 1 2 1413d 1426d 0/1 upstream: reported on 2022/12/17 21:41
linux-4.19 BUG: soft lockup in tcp_write_timer (2) 1 2 1823d 1886d 0/1 auto-closed as invalid on 2022/03/16 10:56
android-54 BUG: soft lockup in tcp_write_timer 1 1 558d 558d 0/2 auto-obsoleted due to no activity on 2025/08/01 21:51
linux-4.19 BUG: soft lockup in tcp_write_timer 1 1 2051d 2051d 0/1 auto-closed as invalid on 2021/07/30 14:52
upstream BUG: soft lockup in tcp_write_timer (9) net 1 2 340d 344d 0/29 closed as invalid on 2026/01/07 12:42
upstream BUG: soft lockup in tcp_write_timer (2) kvm 1 1 1662d 1662d 0/29 auto-closed as invalid on 2022/06/24 22:31
upstream BUG: soft lockup in tcp_write_timer (3) net 1 6 1039d 1147d 0/29 closed as invalid on 2024/03/18 17:07
upstream BUG: soft lockup in tcp_write_timer (7) net 1 1 425d 425d 0/29 closed as invalid on 2025/09/29 07:16
upstream BUG: soft lockup in tcp_write_timer (8) mm 1 1 401d 401d 0/29 closed as invalid on 2025/11/04 11:28
upstream BUG: soft lockup in tcp_write_timer (6) bpf 1 1 473d 473d 0/29 closed as invalid on 2025/09/01 08:24
upstream BUG: soft lockup in tcp_write_timer (5) net mm 1 8 528d 590d 0/29 closed as invalid on 2025/07/11 15:27
android-5-15 BUG: soft lockup in tcp_write_timer 1 11 823d 935d 0/2 auto-obsoleted due to no activity on 2024/11/10 05:27
linux-4.14 BUG: soft lockup in tcp_write_timer 1 2 2380d 2459d 0/1 auto-closed as invalid on 2020/09/05 12:42
upstream BUG: soft lockup in tcp_write_timer net 1 11 2659d 2667d 0/29 auto-closed as invalid on 2019/10/25 14:11

Sample crash report:
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (1 GPs behind) idle=1b34/1/0x4000000000000000 softirq=118985/118988 fqs=1
rcu: 	(t=10502 jiffies g=138061 q=81 ncpus=2)
rcu: rcu_preempt kthread starved for 10500 jiffies! g138061 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:26696 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5393 [inline]
 __schedule+0x15ae/0x4700 kernel/sched/core.c:6722
 schedule+0xbd/0x170 kernel/sched/core.c:6796
 schedule_timeout+0x188/0x2d0 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x30d/0x1590 kernel/rcu/tree.c:1667
 rcu_gp_kthread+0x9d/0x3b0 kernel/rcu/tree.c:1866
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
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: 26780 Comm: syz.4.5877 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:__hrtimer_run_queues+0xb2a/0xc10 kernel/time/hrtimer.c:1815
Code: 8c 0f 10 00 0f 0b e9 aa fe ff ff e8 80 0f 10 00 e8 cb d8 88 ff eb a0 e8 74 0f 10 00 e8 bf d8 88 ff eb c6 e8 68 0f 10 00 eb 0c <e8> 61 0f 10 00 eb 05 e8 5a 0f 10 00 4c 8b 74 24 68 43 c6 44 3e 04
RSP: 0018:ffffc90000007100 EFLAGS: 00000087
RAX: ffffffff8177bba6 RBX: 0000011c968868d7 RCX: ffff88802b521e00
RDX: 0000000000010100 RSI: 0000011c9688d2a1 RDI: 0000011c968868d7
RBP: ffffc90000007250 R08: ffff88802db3d5ef R09: 0000000000000000
R10: ffff88802db3d5e0 R11: ffffed1005b67abe R12: ffff8880b8c2b7c0
R13: ffff88802db3d5d8 R14: 0000011c9688d2a1 R15: dffffc0000000000
FS:  00007f37d9ec06c0(0000) GS:ffff8880b8c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000002 CR3: 000000005deb4000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 hrtimer_interrupt+0x39d/0x980 kernel/time/hrtimer.c:1880
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
 __sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0x51/0xc0 arch/x86/kernel/apic/apic.c:1088
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:check_kcov_mode kernel/kcov.c:178 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:241 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x2e/0x90 kernel/kcov.c:309
Code: 48 8b 04 24 65 48 8b 15 60 e0 7b 7e 65 8b 0d 61 e0 7b 7e 81 e1 00 01 ff 00 74 11 81 f9 00 01 00 00 75 5b 83 ba 24 16 00 00 00 <74> 52 8b 8a 00 16 00 00 83 f9 03 75 47 48 8b 8a 08 16 00 00 44 8b
RSP: 0018:ffffc90000007458 EFLAGS: 00000246
RAX: ffffffff813be267 RBX: ffffc90000007488 RCX: 0000000000000100
RDX: ffff88802b521e00 RSI: 0000000000000002 RDI: 0000000000000000
RBP: 0000000000000002 R08: ffff88802b521e00 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000100 R12: ffffffff81776c20
R13: ffff88802ebd8ad0 R14: dffffc0000000000 R15: ffffc90000007488
 unwind_done arch/x86/include/asm/unwind.h:50 [inline]
 unwind_get_return_address+0x37/0xc0 arch/x86/kernel/unwind_orc.c:366
 arch_stack_walk+0x11d/0x190 arch/x86/kernel/stacktrace.c:26
 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
 kasan_save_free_info+0x28/0x40 mm/kasan/generic.c:522
 ____kasan_slab_free+0x126/0x1f0 mm/kasan/common.c:237
 kasan_slab_free include/linux/kasan.h:164 [inline]
 slab_free_hook mm/slub.c:1833 [inline]
 slab_free_freelist_hook+0x154/0x240 mm/slub.c:1859
 slab_free mm/slub.c:3853 [inline]
 __kmem_cache_free+0xba/0x1f0 mm/slub.c:3866
 skb_kfree_head net/core/skbuff.c:946 [inline]
 skb_free_head net/core/skbuff.c:958 [inline]
 skb_release_data+0x609/0x7f0 net/core/skbuff.c:988
 skb_release_all net/core/skbuff.c:1054 [inline]
 __kfree_skb+0x57/0x70 net/core/skbuff.c:1068
 tcp_write_queue_purge+0x140/0x310 net/ipv4/tcp.c:3007
 tcp_done_with_error+0x43/0xc0 net/ipv4/tcp_input.c:4482
 tcp_write_err net/ipv4/tcp_timer.c:72 [inline]
 tcp_write_timeout net/ipv4/tcp_timer.c:281 [inline]
 tcp_retransmit_timer+0x1c94/0x3030 net/ipv4/tcp_timer.c:576
 tcp_write_timer+0x12a/0x280 net/ipv4/tcp_timer.c:709
 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x570/0x810 kernel/time/timer.c:2023
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
 handle_softirqs+0x27d/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:finish_task_switch+0x267/0x8f0 kernel/sched/core.c:5267
Code: 38 09 85 c0 0f 84 30 01 00 00 48 85 db 0f 85 4f 01 00 00 0f 1f 44 00 00 4c 89 e7 e8 c3 96 42 09 e8 2e 38 30 00 fb 4c 8b 65 b8 <49> 8d bc 24 00 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0
RSP: 0018:ffffc9000b767800 EFLAGS: 00000286
RAX: b1c790ba00dd7e00 RBX: 0000000000000000 RCX: b1c790ba00dd7e00
RDX: dffffc0000000000 RSI: ffffffff8aead140 RDI: ffffffff8b3c50e0
RBP: ffffc9000b767850 R08: ffffffff8f8dd86f R09: 1ffffffff1f1bb0d
R10: dffffc0000000000 R11: fffffbfff1f1bb0e R12: ffff88802b521e00
R13: 1ffff110171879a1 R14: dffffc0000000000 R15: ffff8880b8c3cd08
 context_switch kernel/sched/core.c:5396 [inline]
 __schedule+0x15b6/0x4700 kernel/sched/core.c:6722
 preempt_schedule_common+0x82/0xc0 kernel/sched/core.c:6889
 preempt_schedule+0xc0/0xd0 kernel/sched/core.c:6913
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
 class_preempt_destructor include/linux/preempt.h:478 [inline]
 try_to_wake_up+0x6f5/0x10e0 kernel/sched/core.c:4367
 wake_up_process kernel/sched/core.c:4492 [inline]
 wake_up_q+0xb6/0x100 kernel/sched/core.c:1043
 futex_wake+0x42a/0x4f0 kernel/futex/waitwake.c:184
 do_futex+0x35d/0x3e0 kernel/futex/syscalls.c:139
 __do_sys_futex kernel/futex/syscalls.c:211 [inline]
 __se_sys_futex+0x3a9/0x440 kernel/futex/syscalls.c:192
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f37d8f9f559
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f37d9ec00e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f37d9226188 RCX: 00007f37d8f9f559
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f37d922618c
RBP: 00007f37d9226180 R08: 0000000000745ae6 R09: 0000000000000000
R10: 000000000000000e R11: 0000000000000246 R12: 0000000000000000
R13: 00007f37d9226218 R14: 00007ffda906d4d0 R15: 00007ffda906d5b8
 </TASK>
CPU: 1 PID: 26779 Comm: syz.4.5877 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:__sanitizer_cov_trace_switch+0xd8/0xe0 kernel/kcov.c:-1
Code: 48 c1 e3 05 4c 8d 63 28 4d 39 fc 77 9d 49 ff c6 4d 89 33 49 89 4c 1b 08 4d 89 54 1b 10 49 89 7c 1b 18 49 89 54 1b 20 eb 81 5b <41> 5c 41 5e 41 5f c3 90 66 0f 1f 00 c7 87 00 16 00 00 00 00 00 00
RSP: 0018:ffffc900001f0398 EFLAGS: 00000246
RAX: 0000000000000003 RBX: ffffffff901361d2 RCX: 0000000000000003
RDX: ffffffff813bfaa1 RSI: ffffffff8dfa0b00 RDI: 0000000000000001
RBP: ffffc900001f04d8 R08: ffff888024011e00 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000100 R12: ffffc9000b757760
R13: ffffc900001f0488 R14: 0000000000000001 R15: dffffc0000000000
FS:  00007f37d9ee16c0(0000) GS:ffff8880b8d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f37d9e9eff8 CR3: 000000005deb4000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 unwind_next_frame+0x16d1/0x2990 arch/x86/kernel/unwind_orc.c:641
 arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
 kasan_save_free_info+0x28/0x40 mm/kasan/generic.c:522
 ____kasan_slab_free+0x126/0x1f0 mm/kasan/common.c:237
 kasan_slab_free include/linux/kasan.h:164 [inline]
 slab_free_hook mm/slub.c:1833 [inline]
 slab_free_freelist_hook+0x154/0x240 mm/slub.c:1859
 slab_free mm/slub.c:3853 [inline]
 __kmem_cache_free+0xba/0x1f0 mm/slub.c:3866
 skb_kfree_head net/core/skbuff.c:946 [inline]
 skb_free_head net/core/skbuff.c:958 [inline]
 skb_release_data+0x609/0x7f0 net/core/skbuff.c:988
 skb_release_all net/core/skbuff.c:1054 [inline]
 __kfree_skb+0x57/0x70 net/core/skbuff.c:1068
 tcp_rtx_queue_purge net/ipv4/tcp.c:2996 [inline]
 tcp_write_queue_purge+0x217/0x310 net/ipv4/tcp.c:3009
 tcp_done_with_error+0x43/0xc0 net/ipv4/tcp_input.c:4482
 tcp_write_err net/ipv4/tcp_timer.c:72 [inline]
 tcp_write_timeout net/ipv4/tcp_timer.c:281 [inline]
 tcp_retransmit_timer+0x1c94/0x3030 net/ipv4/tcp_timer.c:576
 tcp_write_timer+0x12a/0x280 net/ipv4/tcp_timer.c:709
 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x570/0x810 kernel/time/timer.c:2023
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
 handle_softirqs+0x27d/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:finish_task_switch+0x267/0x8f0 kernel/sched/core.c:5267
Code: 38 09 85 c0 0f 84 30 01 00 00 48 85 db 0f 85 4f 01 00 00 0f 1f 44 00 00 4c 89 e7 e8 c3 96 42 09 e8 2e 38 30 00 fb 4c 8b 65 b8 <49> 8d bc 24 00 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0
RSP: 0018:ffffc9000b757760 EFLAGS: 00000286
RAX: 891c814a44ced100 RBX: 0000000000000000 RCX: 891c814a44ced100
RDX: dffffc0000000000 RSI: ffffffff8aead140 RDI: ffffffff8b3c50e0
RBP: ffffc9000b7577b0 R08: ffffffff92223607 R09: 1ffffffff24446c0
R10: dffffc0000000000 R11: fffffbfff24446c1 R12: ffff888024011e00
R13: 1ffff110171a79a1 R14: dffffc0000000000 R15: ffff8880b8d3cd08
 context_switch kernel/sched/core.c:5396 [inline]
 __schedule+0x15b6/0x4700 kernel/sched/core.c:6722
 preempt_schedule_common+0x82/0xc0 kernel/sched/core.c:6889
 preempt_schedule+0xc0/0xd0 kernel/sched/core.c:6913
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
 smp_call_function_single+0x48d/0x5a0 kernel/smp.c:652
 task_function_call kernel/events/core.c:120 [inline]
 perf_install_in_context+0x5bb/0x920 kernel/events/core.c:2959
 __do_sys_perf_event_open kernel/events/core.c:12951 [inline]
 __se_sys_perf_event_open+0x180d/0x1d40 kernel/events/core.c:12593
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f37d8f9f559
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f37d9ee1028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f37d9226090 RCX: 00007f37d8f9f559
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000080
RBP: 00007f37d9036b20 R08: 0000000000000002 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f37d9226128 R14: 00007f37d9226090 R15: 00007ffda906d5b8
 </TASK>

Crashes (9):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/30 11:50 linux-6.6.y 0aebf2870d53 b498adee .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in tcp_write_timer
2026/09/11 16:10 linux-6.6.y 8b73de7da85f b6a5eeb7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in tcp_write_timer
2026/08/26 16:36 linux-6.6.y dc6160265ffc a2b77b9e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in tcp_write_timer
2026/08/26 16:15 linux-6.6.y dc6160265ffc a2b77b9e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in tcp_write_timer
2026/07/18 10:21 linux-6.6.y da47cbc25466 72524a66 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in tcp_write_timer
2026/05/29 04:32 linux-6.6.y 0a40c6fbd105 4624854e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in tcp_write_timer
2026/05/22 23:04 linux-6.6.y eac8889a3a1c 5f091fcc .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in tcp_write_timer
2026/03/10 11:19 linux-6.6.y 4fc00fe35d46 6972f302 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in tcp_write_timer
2026/06/17 19:14 linux-6.6.y 924b4a879cbb b62b3ded .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf BUG: soft lockup in tcp_write_timer
* Struck through repros no longer work on HEAD.