watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor1:4595] Modules linked in: irq event stamp: 10058806 hardirqs last enabled at (10058805): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (10058805): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (10058805): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (10058805): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (10058805): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (10058806): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (398714): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (398471): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (398471): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4595 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:shrink_dcache_parent+0x148/0x230 fs/dcache.c:1483 RSP: 0018:ffff8801a1c07b88 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffff8801ce17a6e0 RBX: dffffc0000000000 RCX: ffffffff81c6a0d9 RDX: 0000000000000000 RSI: ffffffff81c6a007 RDI: ffff8801a1c07c20 RBP: ffff8801a1c07c78 R08: ffff8801ad9bc680 R09: ffffed0039c2f4ec R10: ffffed0039c2f4ec R11: ffff8801ce17a763 R12: ffff8801a1c07c50 R13: ffff8801a1c07c10 R14: 1ffff10034380f82 R15: ffffed0034380f85 FS: 0000000001062940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe79c01fdc CR3: 00000001a1179000 CR4: 00000000001406f0 DR0: 00000000200001c0 DR1: 00000000200001c0 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: 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:00007ffe79c026e8 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffe79c04490 RDI: 00007ffe79c04490 RBP: 00007ffe79c04490 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 0000000001063940 R13: 0000000000000000 R14: 0000000000000146 R15: 000000000001365e Code: 03 80 3c 18 00 0f 85 f3 00 00 00 49 8d 45 08 49 89 44 24 d0 41 80 3c 1e 00 0f 85 d2 00 00 00 48 8b 85 30 ff ff ff 49 89 44 24 c0 <41> 0f b6 07 84 c0 74 08 3c 03 0f 8e a5 00 00 00 48 8b bd 30 ff Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4593 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:__lock_release kernel/locking/lockdep.c:3726 [inline] RIP: 0010:lock_release+0x454/0xa10 kernel/locking/lockdep.c:3939 RSP: 0018:ffff8801a774f8b8 EFLAGS: 00000802 RAX: dffffc0000000000 RBX: 1ffff10034ee9f1c RCX: 1ffff10034ee81dd RDX: 1ffff10034ee81de RSI: 0000000000000005 RDI: ffff8801a77406c0 RBP: ffff8801a774f9e8 R08: 1ffff10034ee9f20 R09: ffff8801a774f740 R10: 0000000000000003 R11: 0000000000000004 R12: 825406ae2ce9acad R13: ffffffff88d8e320 R14: ffff8801a77406c0 R15: ffff8801a774f900 FS: 0000000001870940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000565329b79008 CR3: 00000001a76cf000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_lock_release include/linux/rcupdate.h:251 [inline] rcu_read_unlock include/linux/rcupdate.h:688 [inline] d_walk+0x716/0xc80 fs/dcache.c:1327 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:00007ffd9e4ae3e8 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffd9e4b0190 RDI: 00007ffd9e4b0190 RBP: 00007ffd9e4b0190 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 0000000001871940 R13: 0000000000000000 R14: 0000000000000158 R15: 000000000001368c Code: c0 0f 85 be 03 00 00 8b 15 ba 33 14 09 85 d2 0f 84 ce 01 00 00 48 b8 00 00 00 00 00 fc ff df 4d 89 f8 49 c1 e8 03 41 c6 04 00 f8 <65> 4c 8b 24 25 c0 ed 01 00 49 8d bc 24 34 08 00 00 48 b8 00 00