watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor2:4508] Modules linked in: irq event stamp: 13589912 hardirqs last enabled at (13589911): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (13589911): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (13589911): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (13589911): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (13589911): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (13589912): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (397692): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (397593): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (397593): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4508 Comm: syz-executor2 Not tainted 4.17.0-rc4+ #14 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:783 [inline] RIP: 0010:seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] RIP: 0010:read_seqcount_begin include/linux/seqlock.h:164 [inline] RIP: 0010:read_seqbegin include/linux/seqlock.h:433 [inline] RIP: 0010:read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] RIP: 0010:d_walk+0x840/0xc80 fs/dcache.c:1248 RSP: 0018:ffff8801a3ee79f8 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff8801a3eda600 RBX: 0000000000000293 RCX: 1ffff100347db5d5 RDX: 0000000000000000 RSI: ffffffff81c6995b RDI: 0000000000000293 RBP: ffff8801a3ee7b78 R08: ffff8801a3edae38 R09: 0000000000000006 R10: ffff8801a3eda600 R11: 0000000000000000 R12: 0000000000000200 R13: dffffc0000000000 R14: 1ffff100347dcf82 R15: ffff8801a3ee7b50 FS: 00000000010ef940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8a2c326af0 CR3: 00000001a3e9c000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: shrink_dcache_parent+0x179/0x230 fs/dcache.c:1486 vfs_rmdir+0x202/0x470 fs/namei.c:3850 do_rmdir+0x523/0x610 fs/namei.c:3911 __do_sys_rmdir fs/namei.c:3929 [inline] __se_sys_rmdir fs/namei.c:3927 [inline] __x64_sys_rmdir+0x36/0x40 fs/namei.c:3927 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455777 RSP: 002b:00007ffc71defd28 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffc71df1ad0 RDI: 00007ffc71df1ad0 RBP: 00007ffc71df1ad0 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 00000000010f0940 R13: 0000000000000000 R14: 000000000000012c R15: 0000000000014bf0 Code: 88 48 89 f8 48 c1 e8 03 42 80 3c 28 00 0f 85 1e 04 00 00 48 83 3d 18 f2 0a 07 00 0f 84 29 02 00 00 e8 35 94 b2 ff 48 89 df 57 9d <0f> 1f 44 00 00 e8 26 94 b2 ff 49 8d 5f 80 48 c1 eb 03 4c 01 eb Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4512 Comm: syz-executor4 Not tainted 4.17.0-rc4+ #14 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__sanitizer_cov_trace_switch+0x8/0x90 kernel/kcov.c:201 RSP: 0018:ffff8801a177f9d8 EFLAGS: 00000296 RAX: 0000000000000000 RBX: ffff8801adf65510 RCX: ffffffff81c5f164 RDX: 0000000000000000 RSI: ffffffff87d34500 RDI: 0000000000000000 RBP: ffff8801a177f9e8 R08: ffff8801a1772700 R09: ffffed0035beca94 R10: ffffed0035beca94 R11: ffff8801adf654a3 R12: ffff8801adf65420 R13: dffffc0000000000 R14: ffff8801adf654a0 R15: ffff8801a177fb50 FS: 000000000162b940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd2e1befcc CR3: 00000001a1733000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: d_walk+0x3d7/0xc80 fs/dcache.c:1277 shrink_dcache_parent+0x179/0x230 fs/dcache.c:1486 vfs_rmdir+0x202/0x470 fs/namei.c:3850 do_rmdir+0x523/0x610 fs/namei.c:3911 __do_sys_rmdir fs/namei.c:3929 [inline] __se_sys_rmdir fs/namei.c:3927 [inline] __x64_sys_rmdir+0x36/0x40 fs/namei.c:3927 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455777 RSP: 002b:00007ffd2e1bf6d8 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffd2e1c1480 RDI: 00007ffd2e1c1480 RBP: 00007ffd2e1c1480 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 000000000162c940 R13: 0000000000000000 R14: 0000000000000120 R15: 0000000000014c02 Code: 00 00 00 55 48 89 f2 48 89 fe bf 07 00 00 00 48 89 e5 48 8b 4d 08 e8 48 fe ff ff 5d c3 66 0f 1f 44 00 00 55 48 89 e5 41 57 41 56 <41> 55 41 54 53 48 8b 46 08 48 83 f8 10 74 6b 76 4a 48 83 f8 20