watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor7:4519] Modules linked in: irq event stamp: 11096058 hardirqs last enabled at (11096057): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (11096057): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (11096057): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (11096057): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (11096057): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (11096058): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (4442508): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (4442453): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (4442453): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4519 Comm: syz-executor7 Not tainted 4.17.0-rc5+ #57 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:lock_acquire+0x270/0x520 kernel/locking/lockdep.c:3909 RSP: 0018:ffff88018be278f0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: ffffed00317c4f23 RCX: 0000000000000000 RDX: 1ffffffff11a30e5 RSI: ffff88018be16e38 RDI: 0000000000000286 RBP: ffff88018be279e0 R08: 0000000000000008 R09: 0000000000000004 R10: ffff88018be16ed8 R11: ffff88018be16600 R12: ffff88018be16600 R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000001cae940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000001cb7978 CR3: 000000018c3dd000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 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:00007ffdb82d2e08 EFLAGS: 00000202 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffdb82d4bb0 RDI: 00007ffdb82d4bb0 RBP: 00007ffdb82d4bb0 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000006 R11: 0000000000000202 R12: 0000000001caf940 R13: 0000000000000000 R14: 000000000000019a R15: 000000000001bb67 Code: 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 00 00 00 00 <48> c7 43 08 00 00 00 00 c7 43 10 00 00 00 00 48 8d 65 d8 5b 41 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4520 Comm: syz-executor6 Not tainted 4.17.0-rc5+ #57 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:look_up_lock_class kernel/locking/lockdep.c:700 [inline] RIP: 0010:find_held_lock+0x0/0x1c0 kernel/locking/lockdep.c:3499 RSP: 0018:ffff88018b8df8a8 EFLAGS: 00000002 RAX: 0000000000000004 RBX: 1ffff1003171bf1b RCX: ffff88018b8df8f8 RDX: 0000000000000004 RSI: ffffffff88c12648 RDI: ffff88018b8d2640 RBP: ffff88018b8df9e0 R08: ffffffff88c12648 R09: ffff88018b8df738 R10: ffffffff8a713a20 R11: 0000000000000004 R12: ffff88018b8df9b8 R13: ffffffff88c12648 R14: ffff88018b8d2640 R15: ffff88018b8df8f8 FS: 00000000027b9940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffcbbe07eac CR3: 000000018bf65000 CR4: 00000000001426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 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:00007ffcbbe085b8 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffcbbe0a360 RDI: 00007ffcbbe0a360 RBP: 00007ffcbbe0a360 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000006 R11: 0000000000000206 R12: 00000000027ba940 R13: 0000000000000000 R14: 0000000000000185 R15: 000000000001bb95 Code: e9 a4 fb ff ff 48 89 95 28 ff ff ff 48 89 b5 30 ff ff ff e8 f3 84 59 00 48 8b 95 28 ff ff ff 48 8b b5 30 ff ff ff e9 58 fb ff ff <55> 48 89 e5 41 57 44 8d 7a ff 41 56 49 63 c7 49 89 f6 41 55 48