watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor7:4506] Modules linked in: irq event stamp: 12744322 hardirqs last enabled at (12744321): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (12744321): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (12744321): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (12744321): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (12744321): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (12744322): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (6528222): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (6528213): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (6528213): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4506 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:lock_acquire+0x257/0x520 kernel/locking/lockdep.c:3923 RSP: 0018:ffff8801a60878d8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: 1ffff10034c10f20 RCX: 0000000000000000 RDX: 1ffffffff11a316d RSI: ffff8801a607e938 RDI: 0000000000000286 RBP: ffff8801a60879c8 R08: 00000000000004b6 R09: 0000000000000004 R10: ffff8801a607e9d8 R11: ffff8801a607e100 R12: ffff8801a607e100 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 FS: 0000000000ee4940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000ef59b8 CR3: 00000001a6003000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 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:00007ffce2732738 EFLAGS: 00000202 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffce27344e0 RDI: 00007ffce27344e0 RBP: 00007ffce27344e0 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000202 R12: 0000000000ee5940 R13: 0000000000000000 R14: 00000000000009be R15: 000000000006d897 Code: 00 00 00 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 5e 02 00 00 48 83 3d e0 7c 74 07 00 0f 84 c8 01 00 00 48 8b bd 20 ff ff ff 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 01 c3 48 c7 03 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4505 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_release kernel/locking/lockdep.c:3717 [inline] RIP: 0010:lock_release+0x3df/0xa10 kernel/locking/lockdep.c:3939 RSP: 0018:ffff8801ae9c78b0 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: 1ffff10035d38f1b RCX: 1ffff10035d3711d RDX: 0000000000000003 RSI: 1ffff10035d3712e RDI: ffff8801ae9b88e8 RBP: ffff8801ae9c79e0 R08: ffffffff88c12648 R09: ffff8801ae9c7738 R10: ffffffff8a713a20 R11: 0000000000000004 R12: fa01a514a9081e68 R13: ffffffff88c12648 R14: ffff8801ae9b80c0 R15: ffff8801ae9c78f8 FS: 0000000000a8c940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000a95978 CR3: 00000001b1eca000 CR4: 00000000001406e0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: seqcount_lockdep_reader_access include/linux/seqlock.h:82 [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+0x1d5/0xc80 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:00007ffc7d961068 EFLAGS: 00000202 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffc7d962e10 RDI: 00007ffc7d962e10 RBP: 00007ffc7d962e10 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000202 R12: 0000000000a8d940 R13: 0000000000000000 R14: 00000000000009e2 R15: 000000000006d956 Code: 8d be 28 08 00 00 4c 8b 20 48 b8 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 80 3c 01 00 0f 85 51 05 00 00 4d 89 a6 28 08 00 00 <83> c2 01 44 89 de 4c 89 f7 44 89 9d f0 fe ff ff e8 4c e7 ff ff