watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor0:4535] Modules linked in: irq event stamp: 11611282 hardirqs last enabled at (11611281): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (11611281): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (11611281): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (11611281): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (11611281): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (11611282): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (837050): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (836937): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (836937): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4535 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:d_walk+0x37d/0xc80 fs/dcache.c:1271 RSP: 0018:ffff8801a633f9f8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: ffff8801b4c1b6f0 RCX: ffffffff815e08fe RDX: 0000000000000000 RSI: ffffffff81c6945b RDI: ffff8801ce1577e0 RBP: ffff8801a633fb78 R08: ffffed0039c2aefd R09: ffffed0039c2aefc R10: ffffed0039c2aefc R11: ffff8801ce1577e3 R12: ffff8801b4c1b600 R13: dffffc0000000000 R14: 00000000000804c0 R15: ffff8801a633fb50 FS: 0000000000d60940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000d69978 CR3: 00000001a61d2000 CR4: 00000000001406f0 DR0: 00000000200001c0 DR1: 00000000200001c0 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:00007fff9af2c818 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007fff9af2e5c0 RDI: 00007fff9af2e5c0 RBP: 00007fff9af2e5c0 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 0000000000d61940 R13: 0000000000000000 R14: 000000000000022a R15: 000000000001d60b Code: 00 00 48 8b 03 48 89 85 e8 fe ff ff 4c 89 e0 48 c1 e8 03 42 0f b6 04 28 84 c0 74 08 3c 03 0f 8e e9 07 00 00 44 8b b3 10 ff ff ff <31> ff 41 81 e6 00 00 00 20 44 89 f6 e8 f2 99 b2 ff 45 85 f6 0f Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4540 Comm: syz-executor5 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+0x5b/0x520 kernel/locking/lockdep.c:3909 RSP: 0018:ffff88019ffef8d8 EFLAGS: 00000296 RAX: ffffed0033ffdf20 RBX: 1ffff10033ffdf20 RCX: dffffc0000000000 RDX: ffff88019ffe62c0 RSI: 0000000000000001 RDI: ffff88019ffe6af4 RBP: ffff88019ffef9c8 R08: 0000000000000001 R09: 0000000000000000 R10: ffffed0039c2424c R11: ffff8801ce121263 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 FS: 000000000244f940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc51bf6fc8 CR3: 000000019fd5e000 CR4: 00000000001406e0 DR0: 00000000200001c0 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: _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:00007ffc51bf7198 EFLAGS: 00000202 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffc51bf8f40 RDI: 00007ffc51bf8f40 RBP: 00007ffc51bf8f40 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000202 R12: 0000000002450940 R13: 0000000000000000 R14: 000000000000023f R15: 000000000001d59c Code: 04 0b 48 81 ec c8 00 00 00 48 89 bd 30 ff ff ff 65 48 8b 14 25 c0 ed 01 00 48 8d ba 34 08 00 00 48 c7 85 38 ff ff ff b3 8a b5 41 <48> c7 85 40 ff ff ff 9f 8b 9a 88 48 c7 85 48 ff ff ff 40 0c 5d