BUG: soft lockup in tasklet_action_common

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: a1b977b4 Linux 4.19.150
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=10a5f6cf900000
kernel config: https://syzkaller.appspot.com/x/.config?x=c14008c8da1ca4d4
dashboard link: https://syzkaller.appspot.com/bug?extid=8558f29ec66a172f38fa
compiler: gcc (GCC) 10.1.0-syz 20200507

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

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8558f2...@syzkaller.appspotmail.com

watchdog: BUG: soft lockup - CPU#0 stuck for 119s! [syz-executor.1:18700]
Modules linked in:
irq event stamp: 51150809
hardirqs last enabled at (51150808): [<ffffffff8100696e>] trace_hardirqs_on_thunk+0x1a/0x1c
hardirqs last disabled at (51150809): [<ffffffff8100698a>] trace_hardirqs_off_thunk+0x1a/0x1c
softirqs last enabled at (51150056): [<ffffffff87e006d1>] __do_softirq+0x6d1/0xad2 kernel/softirq.c:318
softirqs last disabled at (51150059): [<ffffffff8144294d>] invoke_softirq kernel/softirq.c:372 [inline]
softirqs last disabled at (51150059): [<ffffffff8144294d>] irq_exit+0x22d/0x270 kernel/softirq.c:412
CPU: 0 PID: 18700 Comm: syz-executor.1 Not tainted 4.19.150-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline]
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa7/0xf0 kernel/locking/spinlock.c:184
Code: 48 c7 c0 e8 89 63 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 4a 48 83 3d 48 6d b2 01 00 74 21 48 89 df 57 9d <0f> 1f 44 00 00 eb b2 e8 f1 4c 4f f9 eb c0 0f 0b 48 c7 c7 c0 ed 70
RSP: 0000:ffff8880ae207e68 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff12c713d RBX: 0000000000000286 RCX: 1ffff11008d20565
RDX: dffffc0000000000 RSI: ffff888046902b08 RDI: 0000000000000286
RBP: ffff8880ae225bc0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000019000
R13: ffff888048ad9c20 R14: ffff888048adc860 R15: dffffc0000000000
FS: 00007f3b7f1b6700(0000) GS:ffff8880ae200000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f14b171e000 CR3: 000000000946d000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
hrtimer_start include/linux/hrtimer.h:398 [inline]
tasklet_hrtimer_start include/linux/interrupt.h:641 [inline]
mac80211_hwsim_beacon+0x16c/0x1b0 drivers/net/wireless/mac80211_hwsim.c:1627
__tasklet_hrtimer_trampoline+0x29/0xa0 kernel/softirq.c:601
tasklet_action_common.constprop.0+0x265/0x3a0 kernel/softirq.c:522
__do_softirq+0x27d/0xad2 kernel/softirq.c:292
invoke_softirq kernel/softirq.c:372 [inline]
irq_exit+0x22d/0x270 kernel/softirq.c:412
exiting_irq arch/x86/include/asm/apic.h:544 [inline]
smp_apic_timer_interrupt+0x15f/0x5d0 arch/x86/kernel/apic/apic.c:1094
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
</IRQ>
RIP: 0010:write_comp_data+0x23/0x70 kernel/kcov.c:122
Code: 1f 84 00 00 00 00 00 49 89 f1 49 89 fa 65 48 8b 34 25 40 ee 01 00 65 8b 05 0a 1b 90 7e a9 00 01 1f 00 75 4f 8b 86 e0 12 00 00 <83> f8 03 75 44 48 8b 86 e8 12 00 00 8b b6 e4 12 00 00 48 8b 38 48
RSP: 0000:ffff88804a9776e8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81931305
RDX: 0000000000000000 RSI: ffff888046902280 RDI: 0000000000000007
RBP: ffffea00016c7b80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000007 R11: 0000000000000001 R12: ffffea00016c7b88
R13: ffffea0000dd1448 R14: ffffea0000dd1448 R15: ffffea00016c7b88
compound_head include/linux/page-flags.h:144 [inline]
activate_page+0x45/0x760 mm/swap.c:308
mark_page_accessed+0x382/0xe70 mm/swap.c:385
zap_pte_range mm/memory.c:1347 [inline]
zap_pmd_range mm/memory.c:1452 [inline]
zap_pud_range mm/memory.c:1481 [inline]
zap_p4d_range mm/memory.c:1502 [inline]
unmap_page_range+0x1a35/0x2ec0 mm/memory.c:1523
unmap_single_vma+0x198/0x300 mm/memory.c:1568
unmap_vmas+0xa9/0x180 mm/memory.c:1598
exit_mmap+0x2b9/0x530 mm/mmap.c:3093
__mmput kernel/fork.c:1015 [inline]
mmput+0x14e/0x4a0 kernel/fork.c:1036
exit_mm kernel/exit.c:546 [inline]
do_exit+0xb12/0x2d80 kernel/exit.c:874
do_group_exit+0x125/0x320 kernel/exit.c:990
get_signal+0x3f3/0x2270 kernel/signal.c:2588
do_signal+0x8f/0x1690 arch/x86/kernel/signal.c:821
exit_to_usermode_loop+0x204/0x2c0 arch/x86/entry/common.c:163
prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
do_syscall_64+0x57c/0x670 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45de59
Code: Bad RIP value.
RSP: 002b:00007f3b7f1b5c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000019
RAX: fffffffffffffff2 RBX: 0000000000021c80 RCX: 000000000045de59
RDX: 0000000000800000 RSI: 0000000000002000 RDI: 0000000020a94000
RBP: 000000000118bf70 R08: 0000000020130000 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 000000000118bf2c
R13: 00007ffe87a2662f R14: 00007f3b7f1b69c0 R15: 000000000118bf2c
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


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.