BUG: soft lockup in tcp_delack_timer

From: syzbot
Date: Thu Aug 08 2019 - 12:57:09 EST

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Hello,

syzbot found the following crash on:

HEAD commit: 0d8b3265 Add linux-next specific files for 20190729
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1101fdc8600000
kernel config: https://syzkaller.appspot.com/x/.config?x=ae96f3b8a7e885f7
dashboard link: https://syzkaller.appspot.com/bug?extid=2d55fb97f42947bbcddd
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+2d55fb97f42947bbcddd@xxxxxxxxxxxxxxxxxxxxxxxxx

net_ratelimit: 2 callbacks suppressed
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters.
watchdog: BUG: soft lockup - CPU#0 stuck for 122s! [swapper/0:0]
Modules linked in:
irq event stamp: 92022
hardirqs last enabled at (92021): [<ffffffff81660331>] tick_nohz_idle_exit+0x181/0x2e0 kernel/time/tick-sched.c:1180
hardirqs last disabled at (92022): [<ffffffff873d5d7d>] __schedule+0x1dd/0x15b0 kernel/sched/core.c:3862
softirqs last enabled at (90810): [<ffffffff876006cd>] __do_softirq+0x6cd/0x98c kernel/softirq.c:319
softirqs last disabled at (90703): [<ffffffff8144fc1b>] invoke_softirq kernel/softirq.c:373 [inline]
softirqs last disabled at (90703): [<ffffffff8144fc1b>] irq_exit+0x19b/0x1e0 kernel/softirq.c:413
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0-rc2-next-20190729 #54
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: ffff8880621cd088 RCX: ffffffff8158f117
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880621cd088
RBP: ffff8880ae809c08 R08: 1ffff1100c439a11 R09: ffffed100c439a12
R10: ffffed100c439a11 R11: ffff8880621cd08b R12: 0000000000000001
R13: 0000000000000003 R14: ffffed100c439a11 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001541e88 CR3: 0000000068089000 CR4: 00000000001406f0
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_delack_timer+0x2b/0x2a0 net/ipv4/tcp_timer.c:318
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:536 [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: c8 75 6e fa eb 8a 90 90 90 90 90 90 e9 07 00 00 00 0f 00 2d c4 b2 49 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d b4 b2 49 00 fb f4 <c3> 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 8e 56 21 fa e8 29
RSP: 0018:ffffffff88c07ce8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff11a5e87 RBX: ffffffff88c7a1c0 RCX: 1ffffffff134bca6
RDX: dffffc0000000000 RSI: ffffffff81779dee RDI: ffffffff873e794c
RBP: ffffffff88c07d18 R08: ffffffff88c7a1c0 R09: fffffbfff118f439
R10: fffffbfff118f438 R11: ffffffff88c7a1c7 R12: dffffc0000000000
R13: ffffffff89a5b340 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: 1.339 msecs
NMI backtrace for cpu 1
CPU: 1 PID: 7447 Comm: syz-executor.5 Not tainted 5.3.0-rc2-next-20190729 #54
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:ffff8880ae909210 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffff8880621cd088 RCX: ffffffff8158f117
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880621cd088
RBP: ffff8880ae9092d0 R08: 1ffff1100c439a11 R09: ffffed100c439a12
R10: ffffed100c439a11 R11: ffff8880621cd08b R12: 0000000000000001
R13: 0000000000000003 R14: ffffed100c439a11 R15: 0000000000000001
FS: 0000555557246940(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32b29000 CR3: 00000000a4e3a000 CR4: 00000000001406e0
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:00007ffebfc402f0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000413511
RDX: 0000000000000000 RSI: 000000000000183f RDI: 0000000000000004
RBP: 0000000000000001 R08: 00000000c44ab83f R09: 00000000c44ab843
R10: 00007ffebfc403d0 R11: 0000000000000293 R12: 000000000075c9a0
R13: 000000000075c9a0 R14: 0000000000760750 R15: ffffffffffffffff

---
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Next message: Mike Kravetz: "Re: [PATCH] hugetlbfs: fix hugetlb page migration/fault race causing SIGBUS"
Previous message: Daniel Jordan: "Re: [PATCH] padata: initialize pd->cpu with effective cpumask"
Next in thread: Thomas Gleixner: "Re: BUG: soft lockup in tcp_delack_timer"
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