watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor6:5752]
Modules linked in:
irq event stamp: 50656
hardirqs last  enabled at (50655): [<ffffffff878009d5>] restore_regs_and_return_to_kernel+0x0/0x2b
hardirqs last disabled at (50656): [<ffffffff87800905>] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625
softirqs last  enabled at (1430): [<ffffffff87a00778>] __do_softirq+0x778/0xaf5 kernel/softirq.c:311
softirqs last disabled at (1333): [<ffffffff81475281>] invoke_softirq kernel/softirq.c:365 [inline]
softirqs last disabled at (1333): [<ffffffff81475281>] irq_exit+0x1d1/0x200 kernel/softirq.c:405
CPU: 0 PID: 5752 Comm: syz-executor6 Not tainted 4.17.0-rc5+ #57
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:loop_set_fd drivers/block/loop.c:904 [inline]
RIP: 0010:lo_ioctl+0x1be0/0x2130 drivers/block/loop.c:1397
RSP: 0018:ffff880153747948 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 1ffff1003931e184 RBX: ffff8801d2928480 RCX: dffffc0000000000
RDX: 0000000000040000 RSI: ffffffff84b2e335 RDI: ffff8801c98f0c20
RBP: ffff8801537479c0 R08: ffff8801c2432040 R09: ffff880153747518
R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000000
R13: ffff8801c98f0898 R14: ffff8801d4fee360 R15: ffff8801d4fee280
FS:  00007f3e959c5700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31322000 CR3: 00000001a9f8e000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __blkdev_driver_ioctl block/ioctl.c:303 [inline]
 blkdev_ioctl+0x9b6/0x2020 block/ioctl.c:601
 block_ioctl+0xee/0x130 fs/block_dev.c:1877
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x1cf/0x16a0 fs/ioctl.c:684
 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:701
 __do_sys_ioctl fs/ioctl.c:708 [inline]
 __se_sys_ioctl fs/ioctl.c:706 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:706
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455a09
RSP: 002b:00007f3e959c4c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f3e959c56d4 RCX: 0000000000455a09
RDX: 0000000000000013 RSI: 0000000000004c00 RDI: 0000000000000014
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000002b2 R14: 00000000006f8150 R15: 0000000000000000
Code: 45 a8 83 f8 07 0f 85 8f f4 ff ff e8 bb 4b c6 fc 49 8d bd 88 03 00 00 b9 ff ff 37 00 48 89 f8 48 c1 e1 2a 48 c1 e8 03 80 3c 08 00 <0f> 85 3f 05 00 00 4d 8b ad 88 03 00 00 4d 39 ef 0f 84 af fc ff 
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54