syzbot


BUG: soft lockup in tcp_write_timer (3)

Status: upstream: reported on 2022/12/17 21:41
Reported-by: syzbot+4b44cbef2716e6bf7ce8@syzkaller.appspotmail.com
First crash: 490d, last: 477d
Similar bugs (9)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.14 BUG: soft lockup in tcp_write_timer 2 1444d 1523d 0/1 auto-closed as invalid on 2020/09/05 12:42
linux-4.19 BUG: soft lockup in tcp_write_timer (2) 2 887d 951d 0/1 auto-closed as invalid on 2022/03/16 10:56
linux-4.19 BUG: soft lockup in tcp_write_timer 1 1116d 1116d 0/1 auto-closed as invalid on 2021/07/30 14:52
upstream BUG: soft lockup in tcp_write_timer net 11 1723d 1731d 0/26 auto-closed as invalid on 2019/10/25 14:11
upstream BUG: soft lockup in tcp_write_timer (2) kvm 1 726d 726d 0/26 auto-closed as invalid on 2022/06/24 22:31
upstream BUG: soft lockup in tcp_write_timer (3) net 6 104d 211d 0/26 closed as invalid on 2024/03/18 17:07
android-5-15 BUG: soft lockup in tcp_write_timer 1 6h29m 6h29m 0/2 premoderation: reported on 2024/04/21 15:01
upstream INFO: rcu detected stall in tcp_write_timer (2) bpf 2 1174d 1229d 0/26 auto-closed as invalid on 2021/05/03 11:59
upstream INFO: rcu detected stall in tcp_write_timer (3) net 1 1041d 1041d 0/26 auto-closed as invalid on 2021/09/13 13:17

Sample crash report:
F2FS-fs (loop5): Test dummy encryption mount option ignored
F2FS-fs (loop5): invalid crc value
F2FS-fs (loop5): Found nat_bits in checkpoint
F2FS-fs (loop5): Mounted with checkpoint version = 48b305e4
watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [swapper/0:0]
Modules linked in:
irq event stamp: 60381621
hardirqs last  enabled at (60381620): [<ffffffff81549445>] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline]
hardirqs last  enabled at (60381620): [<ffffffff81549445>] read_seqcount_begin include/linux/seqlock.h:164 [inline]
hardirqs last  enabled at (60381620): [<ffffffff81549445>] ktime_get+0x235/0x2f0 kernel/time/timekeeping.c:756
hardirqs last disabled at (60381621): [<ffffffff81003d00>] trace_hardirqs_off_thunk+0x1a/0x1c
softirqs last  enabled at (13708320): [<ffffffff813925ad>] irq_enter+0xbd/0xd0 kernel/softirq.c:354
softirqs last disabled at (13708321): [<ffffffff813927d5>] invoke_softirq kernel/softirq.c:372 [inline]
softirqs last disabled at (13708321): [<ffffffff813927d5>] irq_exit+0x215/0x260 kernel/softirq.c:412
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:write_comp_data+0x3/0x70 kernel/kcov.c:116
Code: 88 68 13 00 00 8b 80 64 13 00 00 48 8b 11 48 83 c2 01 48 39 d0 76 07 48 89 34 d1 48 89 11 c3 0f 1f 84 00 00 00 00 00 49 89 f1 <49> 89 fa 65 48 8b 34 25 c0 df 01 00 65 8b 05 7a 59 9f 7e a9 00 01
RSP: 0018:ffff8880ba0073f0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000011 RBX: ffff8880a3656a00 RCX: ffffffff868c9982
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000001
RBP: 00000000adbf0a0c R08: ffffffff8c665018 R09: 0000000000000002
R10: 0000000000000001 R11: ffffffff8c66501b R12: 1ffff11017400e84
R13: 0000000000000000 R14: ffff8880a3656a70 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc4cb4031b8 CR3: 0000000009e6d000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 psched_l2t_ns include/net/sch_generic.h:1070 [inline]
 tcf_police_act+0x5f2/0xe60 net/sched/act_police.c:253
 tcf_action_exec net/sched/act_api.c:618 [inline]
 tcf_action_exec+0x160/0x400 net/sched/act_api.c:598
 tcf_exts_exec include/net/pkt_cls.h:388 [inline]
 basic_classify+0x184/0x2b0 net/sched/cls_basic.c:52
 tcf_classify+0x120/0x3c0 net/sched/cls_api.c:979
 prio_classify net/sched/sch_prio.c:46 [inline]
 prio_enqueue+0x3bb/0x7a0 net/sched/sch_prio.c:78
 __dev_xmit_skb net/core/dev.c:3494 [inline]
 __dev_queue_xmit+0x140a/0x2e00 net/core/dev.c:3807
 neigh_hh_output include/net/neighbour.h:491 [inline]
 neigh_output include/net/neighbour.h:499 [inline]
 ip_finish_output2+0xb6d/0x15a0 net/ipv4/ip_output.c:230
 ip_finish_output+0xae9/0x10b0 net/ipv4/ip_output.c:318
 NF_HOOK_COND include/linux/netfilter.h:278 [inline]
 ip_output+0x203/0x5f0 net/ipv4/ip_output.c:406
 dst_output include/net/dst.h:455 [inline]
 ip_local_out+0xaf/0x170 net/ipv4/ip_output.c:125
 __ip_queue_xmit+0x91e/0x1c10 net/ipv4/ip_output.c:507
 __tcp_transmit_skb+0x1b9c/0x3400 net/ipv4/tcp_output.c:1148
 tcp_transmit_skb net/ipv4/tcp_output.c:1164 [inline]
 tcp_xmit_probe_skb+0x2e8/0x390 net/ipv4/tcp_output.c:3682
 tcp_write_wakeup+0x1bd/0x610 net/ipv4/tcp_output.c:3735
 tcp_send_probe0+0x46/0x400 net/ipv4/tcp_output.c:3750
 tcp_probe_timer net/ipv4/tcp_timer.c:380 [inline]
 tcp_write_timer_handler+0x8c2/0xa60 net/ipv4/tcp_timer.c:597
 tcp_write_timer+0x103/0x1b0 net/ipv4/tcp_timer.c:613
 call_timer_fn+0x177/0x700 kernel/time/timer.c:1338
 expire_timers+0x243/0x4e0 kernel/time/timer.c:1375
 __run_timers kernel/time/timer.c:1696 [inline]
 run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1709
 __do_softirq+0x265/0x980 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:372 [inline]
 irq_exit+0x215/0x260 kernel/softirq.c:412
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1098
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
 </IRQ>
RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61
Code: 48 89 df e8 f4 20 7f f9 e9 2e ff ff ff 48 89 df e8 e7 20 7f f9 eb 82 90 90 90 90 90 e9 07 00 00 00 0f 00 2d 14 43 4e 00 fb f4 <c3> 90 e9 07 00 00 00 0f 00 2d 04 43 4e 00 f4 c3 90 90 41 56 41 55
RSP: 0018:ffffffff89e07d40 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff13e3054 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffffffff89e78904
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff89f18290
R13: 1ffffffff13c0fb2 R14: 0000000000000000 R15: 0000000000000000
 arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline]
 default_idle+0x49/0x310 arch/x86/kernel/process.c:557
 cpuidle_idle_call kernel/sched/idle.c:153 [inline]
 do_idle+0x2ec/0x4b0 kernel/sched/idle.c:263
 cpu_startup_entry+0xc5/0xe0 kernel/sched/idle.c:369
 start_kernel+0x8d6/0x911 init/main.c:736
 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/12/31 01:32 linux-4.19.y 3f8a27f9e27b ab32d508 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 BUG: soft lockup in tcp_write_timer
2022/12/17 21:41 linux-4.19.y 3f8a27f9e27b 05494336 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 BUG: soft lockup in tcp_write_timer
* Struck through repros no longer work on HEAD.