watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor4:4610] Modules linked in: irq event stamp: 12258410 hardirqs last enabled at (12258409): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (12258409): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (12258409): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (12258409): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (12258409): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (12258410): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (7363066): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (7362943): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (7362943): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4610 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: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:ffff88019d5d79f8 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff88019d5c8440 RBX: 0000000000000293 RCX: 1ffff10033ab919d RDX: 0000000000000000 RSI: ffffffff81c6995b RDI: 0000000000000293 RBP: ffff88019d5d7b78 R08: ffff88019d5c8c78 R09: 0000000000000006 R10: ffff88019d5c8440 R11: 0000000000000000 R12: 0000000000000200 R13: dffffc0000000000 R14: 1ffff10033abaf82 R15: ffff88019d5d7b50 FS: 0000000001420940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fffacdc6fd8 CR3: 000000019d5a2000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000020000000 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:00007ffc058cc008 EFLAGS: 00000202 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffc058cddb0 RDI: 00007ffc058cddb0 RBP: 00007ffc058cddb0 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000202 R12: 0000000001421940 R13: 0000000000000000 R14: 000000000000055c R15: 0000000000042153 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: 4607 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:__lock_acquire+0x1da/0x5140 kernel/locking/lockdep.c:3290 RSP: 0018:ffff88019f12f530 EFLAGS: 00000082 RAX: 0000000000000000 RBX: 00000000b12a1dee RCX: ffffed0033e25eba RDX: 1ffff10033e24d76 RSI: ffff88019f126bb8 RDI: ffff88019f126c79 RBP: ffff88019f12f8c0 R08: 0000000000000008 R09: 0000000000000004 R10: ffff88019f126c58 R11: ffff88019f126380 R12: 0000000064b5543e R13: 0000000000000000 R14: 2b387165db01f8ed R15: 0000000000000001 FS: 00000000011bd940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f618ee851c4 CR3: 000000019f10c000 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 rcu_lock_acquire include/linux/rcupdate.h:246 [inline] rcu_read_lock include/linux/rcupdate.h:632 [inline] d_walk+0x49b/0xc80 fs/dcache.c:1303 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:00007ffc340e04f8 EFLAGS: 00000202 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffc340e22a0 RDI: 00007ffc340e22a0 RBP: 00007ffc340e22a0 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000202 R12: 00000000011be940 R13: 0000000000000000 R14: 0000000000000532 R15: 00000000000420d6 Code: 4c 8b 9c 24 88 00 00 00 48 85 c0 48 89 c3 0f 85 ad 00 00 00 45 31 ff 48 b9 00 00 00 00 00 fc ff df 31 c0 48 03 8c 24 98 00 00 00 <48> 8d 79 08 48 c7 01 00 00 00 00 48 83 e7 f8 48 c7 41 50 00 00