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Date
SubjectBUG: soft lockup in tcp_write_timer
From
Hello,

syzbot found the following crash on:

HEAD commit: 13bf6d6a Add linux-next specific files for 20190725
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=12b1c1f0600000
kernel config: https://syzkaller.appspot.com/x/.config?x=8ae987d803395886
dashboard link: https://syzkaller.appspot.com/bug?extid=97ff1b2561a76fa6c8f1
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+97ff1b2561a76fa6c8f1@syzkaller.appspotmail.com

watchdog: BUG: soft lockup - CPU#0 stuck for 123s! [swapper/0:0]
Modules linked in:
irq event stamp: 90712
hardirqs last enabled at (90711): [<ffffffff8166a741>]
tick_nohz_idle_exit+0x181/0x2e0 kernel/time/tick-sched.c:1180
hardirqs last disabled at (90712): [<ffffffff873dfe1d>]
__schedule+0x1dd/0x1580 kernel/sched/core.c:3821
softirqs last enabled at (89822): [<ffffffff876006cd>]
__do_softirq+0x6cd/0x98c kernel/softirq.c:319
softirqs last disabled at (89807): [<ffffffff8145c19b>] invoke_softirq
kernel/softirq.c:373 [inline]
softirqs last disabled at (89807): [<ffffffff8145c19b>]
irq_exit+0x19b/0x1e0 kernel/softirq.c:413
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0-rc1-next-20190725 #52
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:cpu_relax arch/x86/include/asm/processor.h:656 [inline]
RIP: 0010:virt_spin_lock arch/x86/include/asm/qspinlock.h:84 [inline]
RIP: 0010:native_queued_spin_lock_slowpath+0x132/0x9f0
kernel/locking/qspinlock.c:325
Code: 00 00 00 48 8b 45 d0 65 48 33 04 25 28 00 00 00 0f 85 37 07 00 00 48
81 c4 98 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 f3 90 <e9> 73 ff ff ff
8b 45 98 4c 8d 65 d8 3d 00 01 00 00 0f 84 e5 00 00
RSP: 0018:ffff8880ae809b48 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: ffff888060b8a208 RCX: ffffffff81599777
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff888060b8a208
RBP: ffff8880ae809c08 R08: 1ffff1100c171441 R09: ffffed100c171442
R10: ffffed100c171441 R11: ffff888060b8a20b R12: 0000000000000001
R13: 0000000000000003 R14: ffffed100c171441 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000021000000 CR3: 000000009fa30000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:642 [inline]
queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:50 [inline]
queued_spin_lock include/asm-generic/qspinlock.h:81 [inline]
do_raw_spin_lock+0x20e/0x2e0 kernel/locking/spinlock_debug.c:113
__raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline]
_raw_spin_lock+0x37/0x40 kernel/locking/spinlock.c:151
spin_lock include/linux/spinlock.h:338 [inline]
tcp_write_timer+0x2b/0x1e0 net/ipv4/tcp_timer.c:610
call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1322
expire_timers kernel/time/timer.c:1366 [inline]
__run_timers kernel/time/timer.c:1685 [inline]
__run_timers kernel/time/timer.c:1653 [inline]
run_timer_softirq+0x697/0x17a0 kernel/time/timer.c:1698
__do_softirq+0x262/0x98c kernel/softirq.c:292
invoke_softirq kernel/softirq.c:373 [inline]
irq_exit+0x19b/0x1e0 kernel/softirq.c:413
exiting_irq arch/x86/include/asm/apic.h:537 [inline]
smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1095
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:828
</IRQ>
RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61
Code: 78 d2 6d fa eb 8a 90 90 90 90 90 90 e9 07 00 00 00 0f 00 2d 84 14 49
00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d 74 14 49 00 fb f4 <c3> 90 55 48 89
e5 41 57 41 56 41 55 41 54 53 e8 9e 5d 21 fa e8 69
RSP: 0018:ffffffff88c07ce8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff11a5e5b RBX: ffffffff88c7a1c0 RCX: 1ffffffff134bc46
RDX: dffffc0000000000 RSI: ffffffff817831be RDI: ffffffff873f168c
RBP: ffffffff88c07d18 R08: ffffffff88c7a1c0 R09: fffffbfff118f439
R10: fffffbfff118f438 R11: ffffffff88c7a1c7 R12: dffffc0000000000
R13: ffffffff89a5b040 R14: 0000000000000000 R15: 0000000000000000
arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:571
default_idle_call+0x84/0xb0 kernel/sched/idle.c:94
cpuidle_idle_call kernel/sched/idle.c:154 [inline]
do_idle+0x413/0x760 kernel/sched/idle.c:263
cpu_startup_entry+0x1b/0x20 kernel/sched/idle.c:354
rest_init+0x245/0x37b init/main.c:451
arch_call_rest_init+0xe/0x1b
start_kernel+0x912/0x951 init/main.c:785
x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:472
x86_64_start_kernel+0x77/0x7b arch/x86/kernel/head64.c:453
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241
Sending NMI from CPU 0 to CPUs 1:
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.136
msecs
NMI backtrace for cpu 1
CPU: 1 PID: 23415 Comm: syz-executor.2 Not tainted 5.3.0-rc1-next-20190725
#52
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:__read_once_size include/linux/compiler.h:199 [inline]
RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:31 [inline]
RIP: 0010:atomic_read include/asm-generic/atomic-instrumented.h:27 [inline]
RIP: 0010:virt_spin_lock arch/x86/include/asm/qspinlock.h:83 [inline]
RIP: 0010:native_queued_spin_lock_slowpath+0xb7/0x9f0
kernel/locking/qspinlock.c:325
Code: 01 00 00 00 49 c1 ee 03 41 83 e5 07 48 b8 00 00 00 00 00 fc ff df 49
01 c6 41 83 c5 03 be 04 00 00 00 48 89 df e8 e9 32 53 00 <41> 0f b6 06 41
38 c5 7c 08 84 c0 0f 85 4e 07 00 00 44 8b 3b 45 85
RSP: 0018:ffff8880ae909210 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffff888060b8a208 RCX: ffffffff81599777
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff888060b8a208
RBP: ffff8880ae9092d0 R08: 1ffff1100c171441 R09: ffffed100c171442
R10: ffffed100c171441 R11: ffff888060b8a20b R12: 0000000000000001
R13: 0000000000000003 R14: ffffed100c171441 R15: 0000000000000001
FS: 0000555556dd4940(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2fa2a000 CR3: 000000009a159000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:642 [inline]
queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:50 [inline]
queued_spin_lock include/asm-generic/qspinlock.h:81 [inline]
do_raw_spin_lock+0x20e/0x2e0 kernel/locking/spinlock_debug.c:113
__raw_spin_lock_bh include/linux/spinlock_api_smp.h:136 [inline]
_raw_spin_lock_bh+0x3b/0x50 kernel/locking/spinlock.c:175
spin_lock_bh include/linux/spinlock.h:343 [inline]
release_sock+0x20/0x1c0 net/core/sock.c:2932
wait_on_pending_writer+0x20f/0x420 net/tls/tls_main.c:91
tls_sk_proto_cleanup+0x2c5/0x3e0 net/tls/tls_main.c:295
tls_sk_proto_unhash+0x90/0x3f0 net/tls/tls_main.c:330
tcp_set_state+0x5b9/0x7d0 net/ipv4/tcp.c:2235
tcp_done+0xe2/0x320 net/ipv4/tcp.c:3824
tcp_reset+0x132/0x500 net/ipv4/tcp_input.c:4080
tcp_validate_incoming+0xa2d/0x1660 net/ipv4/tcp_input.c:5440
tcp_rcv_established+0x6b5/0x1e70 net/ipv4/tcp_input.c:5648
tcp_v6_do_rcv+0x41e/0x12c0 net/ipv6/tcp_ipv6.c:1356
tcp_v6_rcv+0x31f1/0x3500 net/ipv6/tcp_ipv6.c:1588
ip6_protocol_deliver_rcu+0x2fe/0x1660 net/ipv6/ip6_input.c:397
ip6_input_finish+0x84/0x170 net/ipv6/ip6_input.c:438
NF_HOOK include/linux/netfilter.h:305 [inline]
NF_HOOK include/linux/netfilter.h:299 [inline]
ip6_input+0xe4/0x3f0 net/ipv6/ip6_input.c:447
dst_input include/net/dst.h:442 [inline]
ip6_rcv_finish+0x1de/0x2f0 net/ipv6/ip6_input.c:76
NF_HOOK include/linux/netfilter.h:305 [inline]
NF_HOOK include/linux/netfilter.h:299 [inline]
ipv6_rcv+0x10e/0x420 net/ipv6/ip6_input.c:272
__netif_receive_skb_one_core+0x113/0x1a0 net/core/dev.c:4999
__netif_receive_skb+0x2c/0x1d0 net/core/dev.c:5113
process_backlog+0x206/0x750 net/core/dev.c:5924
napi_poll net/core/dev.c:6347 [inline]
net_rx_action+0x508/0x10c0 net/core/dev.c:6413
__do_softirq+0x262/0x98c kernel/softirq.c:292
do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1080
</IRQ>
do_softirq.part.0+0x11a/0x170 kernel/softirq.c:337
do_softirq kernel/softirq.c:329 [inline]
__local_bh_enable_ip+0x211/0x270 kernel/softirq.c:189
local_bh_enable include/linux/bottom_half.h:32 [inline]
inet_csk_listen_stop+0x1e0/0x850 net/ipv4/inet_connection_sock.c:993
tcp_close+0xd5b/0x10e0 net/ipv4/tcp.c:2338
inet_release+0xed/0x200 net/ipv4/af_inet.c:427
inet6_release+0x53/0x80 net/ipv6/af_inet6.c:470
__sock_release+0xce/0x280 net/socket.c:590
sock_close+0x1e/0x30 net/socket.c:1268
__fput+0x2ff/0x890 fs/file_table.c:280
____fput+0x16/0x20 fs/file_table.c:313
task_work_run+0x145/0x1c0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:188 [inline]
exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:163
prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
do_syscall_64+0x65f/0x760 arch/x86/entry/common.c:300
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x413511
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48
83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48
89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffd72454c50 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000413511
RDX: 0000000000000000 RSI: 00000000000017f5 RDI: 0000000000000005
RBP: 0000000000000001 R08: 000000002f60b7f5 R09: 000000002f60b7f9
R10: 00007ffd72454d30 R11: 0000000000000293 R12: 000000000075c9a0
R13: 000000000075c9a0 R14: 0000000000761370 R15: ffffffffffffffff


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

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