watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor7:4587] Modules linked in: irq event stamp: 15921938 hardirqs last enabled at (15921937): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (15921937): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (15921937): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (15921937): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (15921937): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (15921938): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (2197200): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (2197145): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (2197145): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4587 Comm: syz-executor7 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:ffff88019f2a79f8 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff8801ae840180 RBX: 0000000000000293 RCX: 1ffff10035d08145 RDX: 0000000000000000 RSI: ffffffff81c6995b RDI: 0000000000000293 RBP: ffff88019f2a7b78 R08: ffff8801ae8409b8 R09: 0000000000000006 R10: ffff8801ae840180 R11: 0000000000000000 R12: 0000000000000200 R13: dffffc0000000000 R14: 1ffff10033e54f82 R15: ffff88019f2a7b50 FS: 000000000135e940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000001367978 CR3: 000000019f25e000 CR4: 00000000001406f0 DR0: 0000000020000000 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:00007ffc1bf6b118 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffc1bf6cec0 RDI: 00007ffc1bf6cec0 RBP: 00007ffc1bf6cec0 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 000000000135f940 R13: 0000000000000000 R14: 00000000000004f1 R15: 0000000000035cfa 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: 4583 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+0x1e5/0x5140 kernel/locking/lockdep.c:3290 RSP: 0018:ffff8801a3a4f520 EFLAGS: 00000086 RAX: 0000000000000000 RBX: ffffffff89c2d068 RCX: ffffed0034749eb8 RDX: 1ffff10034748916 RSI: ffff8801a3a448b8 RDI: ffffed0034749ec0 RBP: ffff8801a3a4f8a8 R08: 0000000000002a14 R09: 0000000000000004 R10: ffff8801a3a44958 R11: ffff8801a3a44080 R12: 1ffff10034749ecc R13: 0000000000000000 R14: c5fdfa39c7ad209c R15: 0000000000000001 FS: 0000000000b6c940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa8c7581ea0 CR3: 00000001a39ab000 CR4: 00000000001406e0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: lock_acquire+0x1dc/0x520 kernel/locking/lockdep.c:3920 _raw_spin_lock_nested+0x28/0x40 kernel/locking/spinlock.c:354 d_walk+0x3ad/0xc80 fs/dcache.c:1274 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:00007ffc07042f48 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffc07044cf0 RDI: 00007ffc07044cf0 RBP: 00007ffc07044cf0 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 0000000000b6d940 R13: 0000000000000000 R14: 000000000000050a R15: 0000000000035ce2 Code: 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 00 00 48 29 f9 83 c1 58 c1 e9 03