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rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (10498 ticks this GP) idle=4a3/1/0x4000000000000000 softirq=22367/22367 fqs=5237 (t=10502 jiffies g=29317 q=3137) NMI backtrace for cpu 0 CPU: 0 PID: 8664 Comm: syz.7.920 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Call Trace: <IRQ> dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106 nmi_cpu_backtrace+0x397/0x3d0 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline] rcu_dump_cpu_stacks+0x22f/0x380 kernel/rcu/tree_stall.h:349 print_cpu_stall+0x31d/0x5f0 kernel/rcu/tree_stall.h:633 check_cpu_stall kernel/rcu/tree_stall.h:727 [inline] rcu_pending kernel/rcu/tree.c:3936 [inline] rcu_sched_clock_irq+0x6d8/0x1110 kernel/rcu/tree.c:2619 update_process_times+0x193/0x200 kernel/time/timer.c:1818 tick_sched_handle kernel/time/tick-sched.c:254 [inline] tick_sched_timer+0x37d/0x560 kernel/time/tick-sched.c:1473 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x4fe/0xc40 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x3bb/0x8d0 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline] __sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline] sysvec_apic_timer_interrupt+0x4d/0xc0 arch/x86/kernel/apic/apic.c:1108 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:check_kcov_mode kernel/kcov.c:172 [inline] RIP: 0010:write_comp_data kernel/kcov.c:227 [inline] RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x1b/0x80 kernel/kcov.c:300 Code: 02 18 4a 89 44 02 20 48 ff c1 48 89 0a c3 90 48 8b 04 24 65 48 8b 0d 84 a1 8a 7e 65 8b 15 85 a1 8a 7e 81 e2 00 01 ff 00 74 11 <81> fa 00 01 00 00 75 57 83 b9 34 16 00 00 00 74 4e 8b 91 10 16 00 RSP: 0018:ffffc90000007ab8 EFLAGS: 00000206 RAX: ffffffff8167ffb9 RBX: 00000000012589c8 RCX: ffff888021140000 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 000000000000ecac R08: dffffc0000000000 R09: fffffbfff1ff7a32 R10: fffffbfff1ff7a32 R11: 1ffffffff1ff7a31 R12: 000000000000efa0 R13: 000000a583a6fb10 R14: ffffffffffffffff R15: 000001fb63109b96 clocksource_delta kernel/time/timekeeping_internal.h:27 [inline] timekeeping_get_delta kernel/time/timekeeping.c:261 [inline] timekeeping_get_ns kernel/time/timekeeping.c:388 [inline] ktime_get+0x159/0x270 kernel/time/timekeeping.c:831 ktime_get_ns include/linux/timekeeping.h:154 [inline] tcp_clock_ns include/net/tcp.h:775 [inline] tcp_mstamp_refresh+0x1c/0x90 net/ipv4/tcp_output.c:55 tcp_write_timer_handler+0x1ad/0x9a0 net/ipv4/tcp_timer.c:643 tcp_write_timer+0x126/0x280 net/ipv4/tcp_timer.c:675 call_timer_fn+0x16c/0x530 kernel/time/timer.c:1451 expire_timers kernel/time/timer.c:1496 [inline] __run_timers+0x525/0x7c0 kernel/time/timer.c:1767 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780 handle_softirqs+0x328/0x820 kernel/softirq.c:576 __do_softirq kernel/softirq.c:610 [inline] invoke_softirq kernel/softirq.c:450 [inline] __irq_exit_rcu+0x12f/0x220 kernel/softirq.c:659 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 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:finish_lock_switch+0x134/0x280 kernel/sched/core.c:4804 Code: be ff ff ff ff e8 7c bd 55 08 85 c0 74 4a 4d 85 ff 75 66 0f 1f 44 00 00 48 89 df e8 36 28 5f 08 e8 a1 74 2a 00 fb 48 83 c4 08 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 48 89 df e8 d9 0f fe ff 43 80 3c RSP: 0018:ffffc900036c7908 EFLAGS: 00000282 RAX: f8f5d1efbd870900 RBX: ffff8880b903a340 RCX: f8f5d1efbd870900 RDX: dffffc0000000000 RSI: ffffffff8a0b1820 RDI: ffffffff8a59a4c0 RBP: 1ffff11017207613 R08: dffffc0000000000 R09: fffffbfff1ff7a1f R10: fffffbfff1ff7a1f R11: 1ffffffff1ff7a1e R12: 1ffff110172075c1 R13: dffffc0000000000 R14: ffff8880b903ae08 R15: 0000000000000000 finish_task_switch+0x12f/0x640 kernel/sched/core.c:4921 context_switch kernel/sched/core.c:5052 [inline] __schedule+0x11c3/0x4390 kernel/sched/core.c:6395 preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6799 irqentry_exit+0x63/0x70 kernel/entry/common.c:432 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:do_user_addr_fault+0x309/0xc80 arch/x86/mm/fault.c:-1 Code: 98 08 8a be 23 05 00 00 31 d2 e8 b2 22 1e 00 2e 2e 2e 31 c0 48 8b 7c 24 20 4c 89 fe e8 d0 5c 79 00 48 85 c0 0f 84 4f 05 00 00 <48> 89 c3 4c 89 64 24 08 49 89 c4 48 c1 e8 03 80 3c 28 00 74 08 4c RSP: 0018:ffffc900036c7ce0 EFLAGS: 00000282 RAX: ffff88805e55cb58 RBX: 0000000000000001 RCX: ffff888021140000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: dffffc0000000000 R08: dffffc0000000000 R09: ffffed100fd63b78 R10: ffffed100fd63b78 R11: 1ffff1100fd63b77 R12: ffffc900036c7db8 R13: 0000000000000214 R14: 0000000000000000 R15: 0000000000000000 handle_page_fault arch/x86/mm/fault.c:1445 [inline] exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1501 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606 RIP: 0010:do_strncpy_from_user lib/strncpy_from_user.c:72 [inline] RIP: 0010:strncpy_from_user+0x271/0x360 lib/strncpy_from_user.c:139 Code: e9 93 00 00 00 e8 4f 95 7d fd 49 83 c5 08 4d 89 f4 4c 8b 74 24 08 4c 8b 3c 24 31 ff 4c 89 e6 e8 15 99 7d fd 49 83 ec 01 72 44 <43> 8a 2c 2f 4a 8d 3c 2b 48 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 RSP: 0018:ffffc900036c7e60 EFLAGS: 00050212 RAX: ffffffff83fa351b RBX: ffff888058f73320 RCX: ffff888021140000 RDX: 0000000000000000 RSI: 0000000000000fe0 RDI: 0000000000000000 RBP: ffff888058f73320 R08: 0000000000000fe0 R09: 0000000000000020 R10: fffff940002c7b81 R11: 1ffffd40002c7b80 R12: 0000000000000fdf R13: 0000000000000000 R14: 0000000000000fe0 R15: 0000000000000000 getname_flags+0xef/0x500 fs/namei.c:149 getname fs/namei.c:217 [inline] __do_sys_mkdirat fs/namei.c:4105 [inline] __se_sys_mkdirat fs/namei.c:4103 [inline] __x64_sys_mkdirat+0x78/0x90 fs/namei.c:4103 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f5bb003bec9 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:00007f5bae2a3038 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f5bb0292fa0 RCX: 00007f5bb003bec9 RDX: 00000000000001ff RSI: 0000000000000000 RDI: ffffffffffffff9c RBP: 00007f5bb00bef91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5bb0293038 R14: 00007f5bb0292fa0 R15: 00007ffdda191e48 </TASK>
| Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025/10/14 20:11 | linux-5.15.y | 29e53a5b1c4f | b6605ba8 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-linux-5-15-kasan-perf | INFO: rcu detected stall in tcp_write_timer | ||
| 2025/09/29 07:40 | linux-5.15.y | 43bb85222e53 | 001c9061 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-linux-5-15-kasan-perf | INFO: rcu detected stall in tcp_write_timer |