bisecting fixing commit since 6500aa436df40a46998f7a56a32e8199a3513e6d building syzkaller on 442206d76b974cca2d83ec763d4cf5ee829eb7d6 testing commit 6500aa436df40a46998f7a56a32e8199a3513e6d with gcc (GCC) 8.1.0 kernel signature: a174958a46a01a5fa87fbdbfb373b1ff67f8bc6346fe509267af450bba50d727 all runs: crashed: INFO: task hung in __fuse_request_send testing current HEAD 3207316b3beec7e38e5dbe2f463df0cec71e0b97 testing commit 3207316b3beec7e38e5dbe2f463df0cec71e0b97 with gcc (GCC) 8.1.0 kernel signature: 8c00157efd4d34f2b184464878eecd0a06fd67666f117513867f0a231ae3554d all runs: crashed: INFO: task hung in __fuse_request_send revisions tested: 2, total time: 31m21.44337176s (build: 17m3.378481291s, test: 13m29.460564332s) the crash still happens on HEAD commit msg: Linux 4.19.164 crash: INFO: task hung in __fuse_request_send 8021q: adding VLAN 0 to HW filter on device batadv0 IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready 8021q: adding VLAN 0 to HW filter on device batadv0 8021q: adding VLAN 0 to HW filter on device batadv0 INFO: task syz-executor.5:6581 blocked for more than 140 seconds. Not tainted 4.19.164-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D27480 6581 5686 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x78c/0x1c10 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 request_wait_answer+0x2fe/0x620 fs/fuse/dev.c:485 __fuse_request_send+0xff/0x190 fs/fuse/dev.c:505 fuse_request_send+0x41/0x80 fs/fuse/dev.c:518 fuse_simple_request+0x2b4/0x610 fs/fuse/dev.c:576 fuse_lookup_name+0x244/0x590 fs/fuse/dir.c:330 fuse_lookup+0xf3/0x3b0 fs/fuse/dir.c:368 __lookup_slow+0x216/0x400 fs/namei.c:1672 lookup_slow+0x51/0x70 fs/namei.c:1689 walk_component+0x694/0x2320 fs/namei.c:1811 lookup_last fs/namei.c:2274 [inline] path_lookupat.isra.43+0x180/0x850 fs/namei.c:2319 filename_lookup.part.57+0x160/0x360 fs/namei.c:2349 filename_lookup fs/namei.c:2342 [inline] user_path_at_empty+0x39/0x40 fs/namei.c:2609 user_path_at include/linux/namei.h:57 [inline] vfs_statx+0xbe/0x150 fs/stat.c:185 vfs_stat include/linux/fs.h:3133 [inline] __do_sys_newstat+0x85/0xe0 fs/stat.c:337 __se_sys_newstat fs/stat.c:333 [inline] __x64_sys_newstat+0x4f/0x70 fs/stat.c:333 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459349 Code: Bad RIP value. RSP: 002b:00007f82790e7c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000459349 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000580 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f82790e86d4 R13: 00000000004e537b R14: 00000000004de6c8 R15: 00000000ffffffff INFO: task syz-executor.5:6584 blocked for more than 140 seconds. Not tainted 4.19.164-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D29528 6584 5686 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x78c/0x1c10 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:589 [inline] rwsem_down_write_failed+0x5c6/0xbf0 kernel/locking/rwsem-xadd.c:618 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0x53/0x90 kernel/locking/rwsem.c:72 inode_lock include/linux/fs.h:748 [inline] lock_mount+0x82/0x290 fs/namespace.c:2039 do_add_mount+0x22/0x310 fs/namespace.c:2416 do_new_mount fs/namespace.c:2483 [inline] do_mount+0x1290/0x2410 fs/namespace.c:2799 ksys_mount+0xba/0xe0 fs/namespace.c:3015 __do_sys_mount fs/namespace.c:3029 [inline] __se_sys_mount fs/namespace.c:3026 [inline] __x64_sys_mount+0xb9/0x150 fs/namespace.c:3026 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459349 Code: Bad RIP value. RSP: 002b:00007f82790c6c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000459349 RDX: 0000000020000000 RSI: 0000000020000180 RDI: 0000000000000000 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 00007f82790c76d4 R13: 00000000004c578b R14: 00000000004d9b20 R15: 00000000ffffffff INFO: task syz-executor.5:6585 blocked for more than 140 seconds. Not tainted 4.19.164-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28536 6585 5686 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x78c/0x1c10 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:589 [inline] rwsem_down_write_failed+0x5c6/0xbf0 kernel/locking/rwsem-xadd.c:618 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0x53/0x90 kernel/locking/rwsem.c:72 inode_lock include/linux/fs.h:748 [inline] fuse_reverse_inval_entry+0x9a/0x5d0 fs/fuse/dir.c:987 fuse_notify_delete fs/fuse/dev.c:1576 [inline] fuse_notify fs/fuse/dev.c:1810 [inline] fuse_dev_do_write+0xb7d/0x2350 fs/fuse/dev.c:1885 fuse_dev_write+0x12a/0x1b0 fs/fuse/dev.c:1969 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x443/0x890 fs/read_write.c:487 vfs_write+0x150/0x4d0 fs/read_write.c:549 ksys_write+0x103/0x260 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x6e/0xb0 fs/read_write.c:608 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459349 Code: Bad RIP value. RSP: 002b:00007f82790a5c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459349 RDX: 000000000000002e RSI: 0000000020000000 RDI: 0000000000000003 RBP: 000000000075c070 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f82790a66d4 R13: 00000000004c8b23 R14: 00000000004df760 R15: 00000000ffffffff INFO: task syz-executor.5:6588 blocked for more than 140 seconds. Not tainted 4.19.164-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D26904 6588 5686 0x00000006 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x78c/0x1c10 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:589 [inline] rwsem_down_write_failed+0x5c6/0xbf0 kernel/locking/rwsem-xadd.c:618 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0x53/0x90 kernel/locking/rwsem.c:72 inode_lock include/linux/fs.h:748 [inline] lock_mount+0x82/0x290 fs/namespace.c:2039 do_add_mount+0x22/0x310 fs/namespace.c:2416 do_new_mount fs/namespace.c:2483 [inline] do_mount+0x1290/0x2410 fs/namespace.c:2799 ksys_mount+0xba/0xe0 fs/namespace.c:3015 __do_sys_mount fs/namespace.c:3029 [inline] __se_sys_mount fs/namespace.c:3026 [inline] __x64_sys_mount+0xb9/0x150 fs/namespace.c:3026 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459349 Code: Bad RIP value. RSP: 002b:00007f8279084c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000459349 RDX: 0000000020000240 RSI: 0000000020000200 RDI: 0000000000000000 RBP: 000000000075c118 R08: 0000000020000400 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f82790856d4 R13: 00000000004c575f R14: 00000000004d9be0 R15: 00000000ffffffff INFO: task syz-executor.2:6597 blocked for more than 140 seconds. Not tainted 4.19.164-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D27448 6597 5680 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x78c/0x1c10 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 request_wait_answer+0x2fe/0x620 fs/fuse/dev.c:485 __fuse_request_send+0xff/0x190 fs/fuse/dev.c:505 fuse_request_send+0x41/0x80 fs/fuse/dev.c:518 fuse_simple_request+0x2b4/0x610 fs/fuse/dev.c:576 fuse_lookup_name+0x244/0x590 fs/fuse/dir.c:330 fuse_lookup+0xf3/0x3b0 fs/fuse/dir.c:368 __lookup_slow+0x216/0x400 fs/namei.c:1672 lookup_slow+0x51/0x70 fs/namei.c:1689 walk_component+0x694/0x2320 fs/namei.c:1811 lookup_last fs/namei.c:2274 [inline] path_lookupat.isra.43+0x180/0x850 fs/namei.c:2319 filename_lookup.part.57+0x160/0x360 fs/namei.c:2349 filename_lookup fs/namei.c:2342 [inline] user_path_at_empty+0x39/0x40 fs/namei.c:2609 user_path_at include/linux/namei.h:57 [inline] vfs_statx+0xbe/0x150 fs/stat.c:185 vfs_stat include/linux/fs.h:3133 [inline] __do_sys_newstat+0x85/0xe0 fs/stat.c:337 __se_sys_newstat fs/stat.c:333 [inline] __x64_sys_newstat+0x4f/0x70 fs/stat.c:333 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459349 Code: Bad RIP value. RSP: 002b:00007f930b2dec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000459349 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000580 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f930b2df6d4 R13: 00000000004e537b R14: 00000000004de6c8 R15: 00000000ffffffff INFO: task syz-executor.2:6600 blocked for more than 140 seconds. Not tainted 4.19.164-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D29608 6600 5680 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x78c/0x1c10 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:589 [inline] rwsem_down_write_failed+0x5c6/0xbf0 kernel/locking/rwsem-xadd.c:618 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0x53/0x90 kernel/locking/rwsem.c:72 inode_lock include/linux/fs.h:748 [inline] lock_mount+0x82/0x290 fs/namespace.c:2039 do_add_mount+0x22/0x310 fs/namespace.c:2416 do_new_mount fs/namespace.c:2483 [inline] do_mount+0x1290/0x2410 fs/namespace.c:2799 ksys_mount+0xba/0xe0 fs/namespace.c:3015 __do_sys_mount fs/namespace.c:3029 [inline] __se_sys_mount fs/namespace.c:3026 [inline] __x64_sys_mount+0xb9/0x150 fs/namespace.c:3026 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459349 Code: Bad RIP value. RSP: 002b:00007f930b2bdc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000459349 RDX: 0000000020000000 RSI: 0000000020000180 RDI: 0000000000000000 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 00007f930b2be6d4 R13: 00000000004c578b R14: 00000000004d9b20 R15: 00000000ffffffff INFO: task syz-executor.2:6603 blocked for more than 140 seconds. Not tainted 4.19.164-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28696 6603 5680 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x78c/0x1c10 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:589 [inline] rwsem_down_write_failed+0x5c6/0xbf0 kernel/locking/rwsem-xadd.c:618 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0x53/0x90 kernel/locking/rwsem.c:72 inode_lock include/linux/fs.h:748 [inline] fuse_reverse_inval_entry+0x9a/0x5d0 fs/fuse/dir.c:987 fuse_notify_delete fs/fuse/dev.c:1576 [inline] fuse_notify fs/fuse/dev.c:1810 [inline] fuse_dev_do_write+0xb7d/0x2350 fs/fuse/dev.c:1885 fuse_dev_write+0x12a/0x1b0 fs/fuse/dev.c:1969 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x443/0x890 fs/read_write.c:487 vfs_write+0x150/0x4d0 fs/read_write.c:549 ksys_write+0x103/0x260 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x6e/0xb0 fs/read_write.c:608 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459349 Code: Bad RIP value. RSP: 002b:00007f930b29cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459349 RDX: 000000000000002e RSI: 0000000020000000 RDI: 0000000000000003 RBP: 000000000075c070 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f930b29d6d4 R13: 00000000004c8b23 R14: 00000000004df760 R15: 00000000ffffffff INFO: task syz-executor.2:6632 blocked for more than 140 seconds. Not tainted 4.19.164-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D27864 6632 5680 0x00000006 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x78c/0x1c10 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:589 [inline] rwsem_down_write_failed+0x5c6/0xbf0 kernel/locking/rwsem-xadd.c:618 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0x53/0x90 kernel/locking/rwsem.c:72 inode_lock include/linux/fs.h:748 [inline] lock_mount+0x82/0x290 fs/namespace.c:2039 do_add_mount+0x22/0x310 fs/namespace.c:2416 do_new_mount fs/namespace.c:2483 [inline] do_mount+0x1290/0x2410 fs/namespace.c:2799 ksys_mount+0xba/0xe0 fs/namespace.c:3015 __do_sys_mount fs/namespace.c:3029 [inline] __se_sys_mount fs/namespace.c:3026 [inline] __x64_sys_mount+0xb9/0x150 fs/namespace.c:3026 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459349 Code: Bad RIP value. RSP: 002b:00007f930b27bc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000459349 RDX: 0000000020000240 RSI: 0000000020000200 RDI: 0000000000000000 RBP: 000000000075c118 R08: 0000000020000400 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f930b27c6d4 R13: 00000000004c575f R14: 00000000004d9be0 R15: 00000000ffffffff INFO: task syz-executor.0:6609 blocked for more than 140 seconds. Not tainted 4.19.164-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D27256 6609 5688 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x78c/0x1c10 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 request_wait_answer+0x2fe/0x620 fs/fuse/dev.c:485 __fuse_request_send+0xff/0x190 fs/fuse/dev.c:505 fuse_request_send+0x41/0x80 fs/fuse/dev.c:518 fuse_simple_request+0x2b4/0x610 fs/fuse/dev.c:576 fuse_lookup_name+0x244/0x590 fs/fuse/dir.c:330 fuse_lookup+0xf3/0x3b0 fs/fuse/dir.c:368 __lookup_slow+0x216/0x400 fs/namei.c:1672 lookup_slow+0x51/0x70 fs/namei.c:1689 walk_component+0x694/0x2320 fs/namei.c:1811 lookup_last fs/namei.c:2274 [inline] path_lookupat.isra.43+0x180/0x850 fs/namei.c:2319 filename_lookup.part.57+0x160/0x360 fs/namei.c:2349 filename_lookup fs/namei.c:2342 [inline] user_path_at_empty+0x39/0x40 fs/namei.c:2609 user_path_at include/linux/namei.h:57 [inline] vfs_statx+0xbe/0x150 fs/stat.c:185 vfs_stat include/linux/fs.h:3133 [inline] __do_sys_newstat+0x85/0xe0 fs/stat.c:337 __se_sys_newstat fs/stat.c:333 [inline] __x64_sys_newstat+0x4f/0x70 fs/stat.c:333 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459349 Code: Bad RIP value. RSP: 002b:00007f14b6b57c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000459349 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000580 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f14b6b586d4 R13: 00000000004e537b R14: 00000000004de6c8 R15: 00000000ffffffff INFO: task syz-executor.0:6612 blocked for more than 140 seconds. Not tainted 4.19.164-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D29608 6612 5688 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x78c/0x1c10 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:589 [inline] rwsem_down_write_failed+0x5c6/0xbf0 kernel/locking/rwsem-xadd.c:618 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0x53/0x90 kernel/locking/rwsem.c:72 inode_lock include/linux/fs.h:748 [inline] lock_mount+0x82/0x290 fs/namespace.c:2039 do_add_mount+0x22/0x310 fs/namespace.c:2416 do_new_mount fs/namespace.c:2483 [inline] do_mount+0x1290/0x2410 fs/namespace.c:2799 ksys_mount+0xba/0xe0 fs/namespace.c:3015 __do_sys_mount fs/namespace.c:3029 [inline] __se_sys_mount fs/namespace.c:3026 [inline] __x64_sys_mount+0xb9/0x150 fs/namespace.c:3026 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459349 Code: Bad RIP value. RSP: 002b:00007f14b6b36c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000459349 RDX: 0000000020000000 RSI: 0000000020000180 RDI: 0000000000000000 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 00007f14b6b376d4 R13: 00000000004c578b R14: 00000000004d9b20 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/1026: #0: 00000000ca0688b0 (rcu_read_lock){....}, at: debug_show_all_locks+0x5b/0x27a kernel/locking/lockdep.c:4442 1 lock held by in:imklog/5330: #0: 00000000e052918b (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xa7/0xd0 fs/file.c:767 2 locks held by syz-executor.5/6581: #0: 000000000c8be76e (&type->i_mutex_dir_key#8){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline] #0: 000000000c8be76e (&type->i_mutex_dir_key#8){++++}, at: lookup_slow+0x43/0x70 fs/namei.c:1688 #1: 000000004f1dfedb (&fi->mutex){+.+.}, at: fuse_lock_inode+0x9a/0xc0 fs/fuse/inode.c:365 1 lock held by syz-executor.5/6584: #0: 000000000c8be76e (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #0: 000000000c8be76e (&type->i_mutex_dir_key#8){++++}, at: lock_mount+0x82/0x290 fs/namespace.c:2039 2 locks held by syz-executor.5/6585: #0: 00000000bae4b0d5 (&fc->killsb){.+.+}, at: fuse_notify_delete fs/fuse/dev.c:1573 [inline] #0: 00000000bae4b0d5 (&fc->killsb){.+.+}, at: fuse_notify fs/fuse/dev.c:1810 [inline] #0: 00000000bae4b0d5 (&fc->killsb){.+.+}, at: fuse_dev_do_write+0x19c5/0x2350 fs/fuse/dev.c:1885 #1: 000000000c8be76e (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #1: 000000000c8be76e (&type->i_mutex_dir_key#8){++++}, at: fuse_reverse_inval_entry+0x9a/0x5d0 fs/fuse/dir.c:987 1 lock held by syz-executor.5/6588: #0: 000000000c8be76e (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #0: 000000000c8be76e (&type->i_mutex_dir_key#8){++++}, at: lock_mount+0x82/0x290 fs/namespace.c:2039 2 locks held by syz-executor.2/6597: #0: 00000000e70f04bd (&type->i_mutex_dir_key#8){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline] #0: 00000000e70f04bd (&type->i_mutex_dir_key#8){++++}, at: lookup_slow+0x43/0x70 fs/namei.c:1688 #1: 0000000039c455a1 (&fi->mutex){+.+.}, at: fuse_lock_inode+0x9a/0xc0 fs/fuse/inode.c:365 1 lock held by syz-executor.2/6600: #0: 00000000e70f04bd (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #0: 00000000e70f04bd (&type->i_mutex_dir_key#8){++++}, at: lock_mount+0x82/0x290 fs/namespace.c:2039 2 locks held by syz-executor.2/6603: #0: 00000000ae196eb6 (&fc->killsb){.+.+}, at: fuse_notify_delete fs/fuse/dev.c:1573 [inline] #0: 00000000ae196eb6 (&fc->killsb){.+.+}, at: fuse_notify fs/fuse/dev.c:1810 [inline] #0: 00000000ae196eb6 (&fc->killsb){.+.+}, at: fuse_dev_do_write+0x19c5/0x2350 fs/fuse/dev.c:1885 #1: 00000000e70f04bd (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #1: 00000000e70f04bd (&type->i_mutex_dir_key#8){++++}, at: fuse_reverse_inval_entry+0x9a/0x5d0 fs/fuse/dir.c:987 1 lock held by syz-executor.2/6632: #0: 00000000e70f04bd (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #0: 00000000e70f04bd (&type->i_mutex_dir_key#8){++++}, at: lock_mount+0x82/0x290 fs/namespace.c:2039 2 locks held by syz-executor.0/6609: #0: 0000000006811bba (&type->i_mutex_dir_key#8){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline] #0: 0000000006811bba (&type->i_mutex_dir_key#8){++++}, at: lookup_slow+0x43/0x70 fs/namei.c:1688 #1: 0000000084dcdd89 (&fi->mutex){+.+.}, at: fuse_lock_inode+0x9a/0xc0 fs/fuse/inode.c:365 1 lock held by syz-executor.0/6612: #0: 0000000006811bba (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #0: 0000000006811bba (&type->i_mutex_dir_key#8){++++}, at: lock_mount+0x82/0x290 fs/namespace.c:2039 2 locks held by syz-executor.0/6613: #0: 00000000ff97e320 (&fc->killsb){.+.+}, at: fuse_notify_delete fs/fuse/dev.c:1573 [inline] #0: 00000000ff97e320 (&fc->killsb){.+.+}, at: fuse_notify fs/fuse/dev.c:1810 [inline] #0: 00000000ff97e320 (&fc->killsb){.+.+}, at: fuse_dev_do_write+0x19c5/0x2350 fs/fuse/dev.c:1885 #1: 0000000006811bba (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #1: 0000000006811bba (&type->i_mutex_dir_key#8){++++}, at: fuse_reverse_inval_entry+0x9a/0x5d0 fs/fuse/dir.c:987 1 lock held by syz-executor.0/6638: #0: 0000000006811bba (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #0: 0000000006811bba (&type->i_mutex_dir_key#8){++++}, at: lock_mount+0x82/0x290 fs/namespace.c:2039 2 locks held by syz-executor.1/6615: #0: 0000000044e11d74 (&type->i_mutex_dir_key#8){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline] #0: 0000000044e11d74 (&type->i_mutex_dir_key#8){++++}, at: lookup_slow+0x43/0x70 fs/namei.c:1688 #1: 00000000a4b66431 (&fi->mutex){+.+.}, at: fuse_lock_inode+0x9a/0xc0 fs/fuse/inode.c:365 1 lock held by syz-executor.1/6618: #0: 0000000044e11d74 (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #0: 0000000044e11d74 (&type->i_mutex_dir_key#8){++++}, at: lock_mount+0x82/0x290 fs/namespace.c:2039 2 locks held by syz-executor.1/6623: #0: 00000000bc2b8417 (&fc->killsb){.+.+}, at: fuse_notify_delete fs/fuse/dev.c:1573 [inline] #0: 00000000bc2b8417 (&fc->killsb){.+.+}, at: fuse_notify fs/fuse/dev.c:1810 [inline] #0: 00000000bc2b8417 (&fc->killsb){.+.+}, at: fuse_dev_do_write+0x19c5/0x2350 fs/fuse/dev.c:1885 #1: 0000000044e11d74 (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #1: 0000000044e11d74 (&type->i_mutex_dir_key#8){++++}, at: fuse_reverse_inval_entry+0x9a/0x5d0 fs/fuse/dir.c:987 1 lock held by syz-executor.1/6644: #0: 0000000044e11d74 (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #0: 0000000044e11d74 (&type->i_mutex_dir_key#8){++++}, at: lock_mount+0x82/0x290 fs/namespace.c:2039 1 lock held by syz-executor.1/6645: #0: 0000000044e11d74 (&type->i_mutex_dir_key#8){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline] #0: 0000000044e11d74 (&type->i_mutex_dir_key#8){++++}, at: lookup_slow+0x43/0x70 fs/namei.c:1688 2 locks held by syz-executor.4/6620: #0: 000000002d350851 (&type->i_mutex_dir_key#8){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline] #0: 000000002d350851 (&type->i_mutex_dir_key#8){++++}, at: lookup_slow+0x43/0x70 fs/namei.c:1688 #1: 00000000a8017ea1 (&fi->mutex){+.+.}, at: fuse_lock_inode+0x9a/0xc0 fs/fuse/inode.c:365 1 lock held by syz-executor.4/6628: #0: 000000002d350851 (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #0: 000000002d350851 (&type->i_mutex_dir_key#8){++++}, at: lock_mount+0x82/0x290 fs/namespace.c:2039 2 locks held by syz-executor.4/6630: #0: 00000000a75f01a4 (&fc->killsb){.+.+}, at: fuse_notify_delete fs/fuse/dev.c:1573 [inline] #0: 00000000a75f01a4 (&fc->killsb){.+.+}, at: fuse_notify fs/fuse/dev.c:1810 [inline] #0: 00000000a75f01a4 (&fc->killsb){.+.+}, at: fuse_dev_do_write+0x19c5/0x2350 fs/fuse/dev.c:1885 #1: 000000002d350851 (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #1: 000000002d350851 (&type->i_mutex_dir_key#8){++++}, at: fuse_reverse_inval_entry+0x9a/0x5d0 fs/fuse/dir.c:987 1 lock held by syz-executor.4/6650: #0: 000000002d350851 (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #0: 000000002d350851 (&type->i_mutex_dir_key#8){++++}, at: lock_mount+0x82/0x290 fs/namespace.c:2039 1 lock held by syz-executor.4/6651: #0: 000000002d350851 (&type->i_mutex_dir_key#8){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline] #0: 000000002d350851 (&type->i_mutex_dir_key#8){++++}, at: lookup_slow+0x43/0x70 fs/namei.c:1688 2 locks held by syz-executor.3/6625: #0: 00000000122d1aa3 (&type->i_mutex_dir_key#8){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline] #0: 00000000122d1aa3 (&type->i_mutex_dir_key#8){++++}, at: lookup_slow+0x43/0x70 fs/namei.c:1688 #1: 0000000063c55089 (&fi->mutex){+.+.}, at: fuse_lock_inode+0x9a/0xc0 fs/fuse/inode.c:365 1 lock held by syz-executor.3/6629: #0: 00000000122d1aa3 (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #0: 00000000122d1aa3 (&type->i_mutex_dir_key#8){++++}, at: lock_mount+0x82/0x290 fs/namespace.c:2039 2 locks held by syz-executor.3/6631: #0: 00000000f2e80ab2 (&fc->killsb){.+.+}, at: fuse_notify_delete fs/fuse/dev.c:1573 [inline] #0: 00000000f2e80ab2 (&fc->killsb){.+.+}, at: fuse_notify fs/fuse/dev.c:1810 [inline] #0: 00000000f2e80ab2 (&fc->killsb){.+.+}, at: fuse_dev_do_write+0x19c5/0x2350 fs/fuse/dev.c:1885 #1: 00000000122d1aa3 (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #1: 00000000122d1aa3 (&type->i_mutex_dir_key#8){++++}, at: fuse_reverse_inval_entry+0x9a/0x5d0 fs/fuse/dir.c:987 1 lock held by syz-executor.3/6656: #0: 00000000122d1aa3 (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #0: 00000000122d1aa3 (&type->i_mutex_dir_key#8){++++}, at: lock_mount+0x82/0x290 fs/namespace.c:2039 1 lock held by syz-executor.3/6657: #0: 00000000122d1aa3 (&type->i_mutex_dir_key#8){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline] #0: 00000000122d1aa3 (&type->i_mutex_dir_key#8){++++}, at: lookup_slow+0x43/0x70 fs/namei.c:1688 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1026 Comm: khungtaskd Not tainted 4.19.164-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x123/0x177 lib/dump_stack.c:118 nmi_cpu_backtrace.cold.4+0x3e/0x76 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0xe6/0x11a lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x5c3/0xb40 kernel/hung_task.c:287 kthread+0x347/0x410 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 10 Comm: rcu_preempt Not tainted 4.19.164-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__trace_hardirqs_on_caller kernel/locking/lockdep.c:2842 [inline] RIP: 0010:lockdep_hardirqs_on+0x1fe/0x5c0 kernel/locking/lockdep.c:2883 Code: 85 c0 0f 85 38 02 00 00 48 8d bb 38 08 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 88 03 00 00 <48> 8d bb 30 08 00 00 4c 89 a3 38 08 00 00 48 b8 00 00 00 00 00 fc RSP: 0018:ffff8881f56d7bc0 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: ffff8881f56bc280 RCX: 0000000000000000 RDX: 1ffff1103ead7957 RSI: 0000000000000001 RDI: ffff8881f56bcab8 RBP: ffff8881f56d7bd0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff8154d939 R13: ffff8881f56d7d00 R14: ffffffff8685e243 R15: ffff8881f6823a00 FS: 0000000000000000(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9a194e1000 CR3: 000000000806d003 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: trace_hardirqs_on+0x28/0x190 kernel/trace/trace_preemptirq.c:30 del_timer_sync+0xc9/0x1e0 kernel/time/timer.c:1297 schedule_timeout+0x3b3/0xe00 kernel/time/timer.c:1819 rcu_gp_kthread+0xce6/0x23d0 kernel/rcu/tree.c:2202 kthread+0x347/0x410 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415