watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor4:4543] Modules linked in: irq event stamp: 24736838 hardirqs last enabled at (24736837): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (24736837): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (24736837): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (24736837): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (24736837): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (24736838): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (24736340): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (24736333): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (24736333): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4543 Comm: syz-executor4 Not tainted 4.17.0-rc4+ #14 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:select_collect+0x6/0x5f0 fs/dcache.c:1443 RSP: 0018:ffff88019f2cf9e0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: ffffffff81c5f080 RBX: ffff8801965fa3b0 RCX: ffffffff815e0571 RDX: 1ffff10032cbf46a RSI: ffff8801965fa2c0 RDI: ffff88019f2cfc10 RBP: ffff88019f2cf9e8 R08: ffffed0032cbf469 R09: ffffed0032cbf468 R10: ffffed0032cbf468 R11: ffff8801965fa343 R12: ffff8801965fa2c0 R13: dffffc0000000000 R14: ffff8801965fa340 R15: ffff88019f2cfb50 FS: 0000000001d16940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000001d1f978 CR3: 000000019f03f000 CR4: 00000000001406f0 DR0: 00000000200001c0 DR1: 00000000200001c0 DR2: 00000000200001c0 DR3: 00000000200001c0 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: d_walk+0x3c3/0xc80 fs/dcache.c:1276 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:00007fff189cfbc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007fff189d1970 RDI: 00007fff189d1970 RBP: 00007fff189d1970 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000202 R12: 0000000001d17940 R13: 0000000000000000 R14: 0000000000001788 R15: 00000000000e09a5 Code: ff ff ff 48 8b 8d 28 ff ff ff 48 8b 85 30 ff ff ff e9 dc fd ff ff 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 57 <41> 56 4c 8d 7d d8 49 be 00 00 00 00 00 fc ff df 41 55 49 89 f5 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:get_current arch/x86/include/asm/current.h:15 [inline] RIP: 0010:write_comp_data+0xa/0x70 kernel/kcov.c:121 RSP: 0018:ffff88019f76f9d8 EFLAGS: 00000246 RAX: ffff88019f760640 RBX: 0000000000000000 RCX: ffffffff81c69805 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: ffff88019f76f9e8 R08: ffff88019f760640 R09: ffffed003b5e46c2 R10: ffffed003b5e46c2 R11: ffff8801daf23613 R12: 0000000000012ccc R13: dffffc0000000000 R14: ffff8801966682c0 R15: ffff88019f76fb50 FS: 0000000001a84940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd547ebefc CR3: 000000019f662000 CR4: 00000000001406e0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: rcu_read_unlock include/linux/rcupdate.h:684 [inline] d_walk+0x6e5/0xc80 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:00007ffd547ec608 EFLAGS: 00000202 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffd547ee3b0 RDI: 00007ffd547ee3b0 RBP: 00007ffd547ee3b0 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000202 R12: 0000000001a85940 R13: 0000000000000000 R14: 0000000000001744 R15: 00000000000e0a04 Code: ff ff 48 8b bd d0 fe ff ff e8 d3 b7 3c 00 e9 bd fc ff ff 4c 89 ef e8 26 b7 3c 00 e9 86 fc ff ff 90 55 65 4c 8b 04 25 c0 ed 01 00 <65> 8b 05 1f c0 88 7e 48 89 e5 a9 00 01 1f 00 75 51 41 8b 80 78