watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor0:4557] Modules linked in: irq event stamp: 11011446 hardirqs last enabled at (11011445): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (11011445): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (11011445): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (11011445): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (11011445): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (11011446): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (1483738): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (1483265): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (1483265): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4557 Comm: syz-executor0 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:ffff8801aa1bf9f8 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff8801aa1b41c0 RBX: 0000000000000293 RCX: 1ffff1003543694d RDX: 0000000000000000 RSI: ffffffff81c6995b RDI: 0000000000000293 RBP: ffff8801aa1bfb78 R08: ffff8801aa1b49f8 R09: 0000000000000006 R10: ffff8801aa1b41c0 R11: 0000000000000000 R12: 0000000000000200 R13: dffffc0000000000 R14: 1ffff10035437f82 R15: ffff8801aa1bfb50 FS: 0000000002139940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000002142978 CR3: 00000001cb3a6000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 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:00007ffdfc1d4c28 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffdfc1d69d0 RDI: 00007ffdfc1d69d0 RBP: 00007ffdfc1d69d0 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 000000000213a940 R13: 0000000000000000 R14: 0000000000000286 R15: 000000000001fe1e 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: 4558 Comm: syz-executor1 Not tainted 4.17.0-rc4+ #14 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_acquire+0x36e/0x5140 kernel/locking/lockdep.c:3347 RSP: 0018:ffff8801a0047530 EFLAGS: 00000006 RAX: ffff8801a003cac8 RBX: 00000000000000b9 RCX: dffffc0000000000 RDX: 0000000000000001 RSI: ffff8801a003ca78 RDI: ffffffff8a23eaf8 RBP: ffff8801a00478c0 R08: 0000000000000001 R09: 0000000000000003 R10: 0000000000000078 R11: ffff8801a003c240 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000002 R15: ffffffff88c12648 FS: 0000000000e99940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc8009df48 CR3: 00000001a0612000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1dc/0x520 kernel/locking/lockdep.c:3920 seqcount_lockdep_reader_access include/linux/seqlock.h:81 [inline] read_seqcount_begin include/linux/seqlock.h:164 [inline] read_seqbegin include/linux/seqlock.h:433 [inline] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] d_walk+0x1c0/0xc80 fs/dcache.c:1248 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:00007ffe53e69a78 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffe53e6b820 RDI: 00007ffe53e6b820 RBP: 00007ffe53e6b820 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 0000000000e9a940 R13: 0000000000000000 R14: 0000000000000277 R15: 000000000001fe02 Code: 14 80 48 89 b4 24 90 00 00 00 69 db 3d cf f3 3c 49 c1 e2 03 83 c3 01 45 85 c9 74 44 48 b9 00 00 00 00 00 fc ff df 4a 8d 44 16 d8 <48> 8d 78 20 48 89 fe 48 c1 ee 03 0f b6 0c 0e 84 c9 74 09 80 f9