bisecting fixing commit since 6500aa436df40a46998f7a56a32e8199a3513e6d building syzkaller on 442206d76b974cca2d83ec763d4cf5ee829eb7d6 testing commit 6500aa436df40a46998f7a56a32e8199a3513e6d with gcc (GCC) 8.4.1 20210217 kernel signature: 2466bdafab35954ed7ca2b98b12789be6da9973aece758db25d56561f80c91ca all runs: crashed: INFO: task hung in __fuse_request_send testing current HEAD 6b7b0056defc6eb5c87bbe4690ccda547b2891aa testing commit 6b7b0056defc6eb5c87bbe4690ccda547b2891aa with gcc (GCC) 8.4.1 20210217 kernel signature: ce26d0915d3f8f104ed3d58764078c81d651e3aa5071648538d3c61a923f34e9 all runs: crashed: INFO: task hung in __fuse_request_send revisions tested: 2, total time: 31m53.913971341s (build: 17m1.664074751s, test: 14m3.199369504s) the crash still happens on HEAD commit msg: Linux 4.19.192 crash: INFO: task hung in __fuse_request_send 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 8021q: adding VLAN 0 to HW filter on device batadv0 INFO: task syz-executor.3:6507 blocked for more than 140 seconds. Not tainted 4.19.192-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D27288 6507 5602 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0xdb5/0x1d40 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+0x697/0x11b0 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:3132 [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: 0033:0x460b89 Code: Bad RIP value. RSP: 002b:00007fcdacd631a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 000000000052bf00 RCX: 0000000000460b89 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000580 RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004f7168 R14: 00000000004c16e3 R15: 00007fcdacd636bc INFO: task syz-executor.3:6510 blocked for more than 140 seconds. Not tainted 4.19.192-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D28616 6510 5602 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0xdb5/0x1d40 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+0x5c7/0xbe0 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+0xba9/0x2400 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: 0033:0x460b89 Code: Bad RIP value. RSP: 002b:00007fcdacd421a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000052bfa8 RCX: 0000000000460b89 RDX: 000000000000002e RSI: 0000000020000000 RDI: 0000000000000003 RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004f8200 R14: 00000000004b4d98 R15: 00007fcdacd426bc INFO: task syz-executor.3:6511 blocked for more than 140 seconds. Not tainted 4.19.192-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D28824 6511 5602 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0xdb5/0x1d40 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+0x5c7/0xbe0 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+0xb1/0xd0 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: 0033:0x460b89 Code: Bad RIP value. RSP: 002b:00007fcdacd211a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000052c050 RCX: 0000000000460b89 RDX: 0000000020000000 RSI: 0000000020000180 RDI: 0000000000000000 RBP: 0000000000000005 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004f25c0 R14: 00000000004b1a00 R15: 00007fcdacd216bc INFO: task syz-executor.3:6551 blocked for more than 140 seconds. Not tainted 4.19.192-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D27960 6551 5602 0x00000006 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0xdb5/0x1d40 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+0x5c7/0xbe0 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+0xb1/0xd0 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: 0033:0x460b89 Code: Bad RIP value. RSP: 002b:00007fcdacd001a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000052c0f8 RCX: 0000000000460b89 RDX: 0000000020000240 RSI: 0000000020000200 RDI: 0000000000000000 RBP: 0000000000000005 R08: 0000000020000400 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004f2680 R14: 00000000004b19d4 R15: 00007fcdacd006bc INFO: task syz-executor.3:6552 blocked for more than 140 seconds. Not tainted 4.19.192-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D29176 6552 5602 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0xdb5/0x1d40 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x21c/0x3e0 kernel/locking/rwsem-xadd.c:309 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x49/0xb0 kernel/locking/rwsem.c:26 inode_lock_shared include/linux/fs.h:758 [inline] lookup_slow+0x43/0x70 fs/namei.c:1688 walk_component+0x697/0x11b0 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:3132 [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: 0033:0x460b89 Code: Bad RIP value. RSP: 002b:00007fcdaccdf1a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 000000000052c1a0 RCX: 0000000000460b89 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000580 RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004f7168 R14: 00000000004c16e3 R15: 00007fcdaccdf6bc INFO: task syz-executor.2:6513 blocked for more than 140 seconds. Not tainted 4.19.192-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D26936 6513 5607 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0xdb5/0x1d40 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+0x697/0x11b0 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:3132 [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: 0033:0x460b89 Code: Bad RIP value. RSP: 002b:00007f6cd07b01a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 000000000052bf00 RCX: 0000000000460b89 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000580 RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004f7168 R14: 00000000004c16e3 R15: 00007f6cd07b06bc INFO: task syz-executor.2:6524 blocked for more than 140 seconds. Not tainted 4.19.192-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D29112 6524 5607 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0xdb5/0x1d40 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+0x5c7/0xbe0 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+0xb1/0xd0 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: 0033:0x460b89 Code: Bad RIP value. RSP: 002b:00007f6cd078f1a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000052bfa8 RCX: 0000000000460b89 RDX: 0000000020000000 RSI: 0000000020000180 RDI: 0000000000000000 RBP: 0000000000000005 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004f25c0 R14: 00000000004b1a00 R15: 00007f6cd078f6bc INFO: task syz-executor.2:6526 blocked for more than 140 seconds. Not tainted 4.19.192-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D27864 6526 5607 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0xdb5/0x1d40 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+0x5c7/0xbe0 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+0xba9/0x2400 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: 0033:0x460b89 Code: Bad RIP value. RSP: 002b:00007f6cd076e1a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000052c050 RCX: 0000000000460b89 RDX: 000000000000002e RSI: 0000000020000000 RDI: 0000000000000003 RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004f8200 R14: 00000000004b4d98 R15: 00007f6cd076e6bc INFO: task syz-executor.2:6557 blocked for more than 140 seconds. Not tainted 4.19.192-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D27816 6557 5607 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0xdb5/0x1d40 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+0x5c7/0xbe0 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+0xb1/0xd0 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: 0033:0x460b89 Code: Bad RIP value. RSP: 002b:00007f6cd074d1a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000052c0f8 RCX: 0000000000460b89 RDX: 0000000020000240 RSI: 0000000020000200 RDI: 0000000000000000 RBP: 0000000000000005 R08: 0000000020000400 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004f2680 R14: 00000000004b19d4 R15: 00007f6cd074d6bc INFO: task syz-executor.2:6558 blocked for more than 140 seconds. Not tainted 4.19.192-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D29176 6558 5607 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0xdb5/0x1d40 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x21c/0x3e0 kernel/locking/rwsem-xadd.c:309 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x49/0xb0 kernel/locking/rwsem.c:26 inode_lock_shared include/linux/fs.h:758 [inline] lookup_slow+0x43/0x70 fs/namei.c:1688 walk_component+0x697/0x11b0 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:3132 [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: 0033:0x460b89 Code: Bad RIP value. RSP: 002b:00007f6cd072c1a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 000000000052c1a0 RCX: 0000000000460b89 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000580 RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004f7168 R14: 00000000004c16e3 R15: 00007f6cd072c6bc Showing all locks held in the system: 1 lock held by khungtaskd/1042: #0: 00000000fce6391f (rcu_read_lock){....}, at: debug_show_all_locks+0x5b/0x27a kernel/locking/lockdep.c:4443 1 lock held by systemd-journal/3285: #0: 000000005f543197 (&rq->lock){-.-.}, at: idle_balance kernel/sched/fair.c:9701 [inline] #0: 000000005f543197 (&rq->lock){-.-.}, at: pick_next_task_fair+0xf32/0x1560 kernel/sched/fair.c:6840 1 lock held by in:imklog/5293: #0: 0000000087c5ef8e (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xa7/0xd0 fs/file.c:767 2 locks held by syz-executor.3/6507: #0: 00000000cb0288ff (&type->i_mutex_dir_key#8){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline] #0: 00000000cb0288ff (&type->i_mutex_dir_key#8){++++}, at: lookup_slow+0x43/0x70 fs/namei.c:1688 #1: 00000000eb8dadf2 (&fi->mutex){+.+.}, at: fuse_lock_inode+0x9a/0xc0 fs/fuse/inode.c:365 2 locks held by syz-executor.3/6510: #0: 00000000b46124f0 (&fc->killsb){.+.+}, at: fuse_notify_delete fs/fuse/dev.c:1573 [inline] #0: 00000000b46124f0 (&fc->killsb){.+.+}, at: fuse_notify fs/fuse/dev.c:1810 [inline] #0: 00000000b46124f0 (&fc->killsb){.+.+}, at: fuse_dev_do_write+0x19e0/0x2400 fs/fuse/dev.c:1885 #1: 00000000cb0288ff (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #1: 00000000cb0288ff (&type->i_mutex_dir_key#8){++++}, at: fuse_reverse_inval_entry+0x9a/0x5d0 fs/fuse/dir.c:987 1 lock held by syz-executor.3/6511: #0: 00000000cb0288ff (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #0: 00000000cb0288ff (&type->i_mutex_dir_key#8){++++}, at: lock_mount+0x82/0x290 fs/namespace.c:2039 1 lock held by syz-executor.3/6551: #0: 00000000cb0288ff (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #0: 00000000cb0288ff (&type->i_mutex_dir_key#8){++++}, at: lock_mount+0x82/0x290 fs/namespace.c:2039 1 lock held by syz-executor.3/6552: #0: 00000000cb0288ff (&type->i_mutex_dir_key#8){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline] #0: 00000000cb0288ff (&type->i_mutex_dir_key#8){++++}, at: lookup_slow+0x43/0x70 fs/namei.c:1688 2 locks held by syz-executor.2/6513: #0: 000000005939974d (&type->i_mutex_dir_key#8){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline] #0: 000000005939974d (&type->i_mutex_dir_key#8){++++}, at: lookup_slow+0x43/0x70 fs/namei.c:1688 #1: 00000000c8684084 (&fi->mutex){+.+.}, at: fuse_lock_inode+0x9a/0xc0 fs/fuse/inode.c:365 1 lock held by syz-executor.2/6524: #0: 000000005939974d (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #0: 000000005939974d (&type->i_mutex_dir_key#8){++++}, at: lock_mount+0x82/0x290 fs/namespace.c:2039 2 locks held by syz-executor.2/6526: #0: 000000002e7ee0ff (&fc->killsb){.+.+}, at: fuse_notify_delete fs/fuse/dev.c:1573 [inline] #0: 000000002e7ee0ff (&fc->killsb){.+.+}, at: fuse_notify fs/fuse/dev.c:1810 [inline] #0: 000000002e7ee0ff (&fc->killsb){.+.+}, at: fuse_dev_do_write+0x19e0/0x2400 fs/fuse/dev.c:1885 #1: 000000005939974d (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #1: 000000005939974d (&type->i_mutex_dir_key#8){++++}, at: fuse_reverse_inval_entry+0x9a/0x5d0 fs/fuse/dir.c:987 1 lock held by syz-executor.2/6557: #0: 000000005939974d (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #0: 000000005939974d (&type->i_mutex_dir_key#8){++++}, at: lock_mount+0x82/0x290 fs/namespace.c:2039 1 lock held by syz-executor.2/6558: #0: 000000005939974d (&type->i_mutex_dir_key#8){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline] #0: 000000005939974d (&type->i_mutex_dir_key#8){++++}, at: lookup_slow+0x43/0x70 fs/namei.c:1688 2 locks held by syz-executor.5/6515: #0: 00000000d8359dd9 (&type->i_mutex_dir_key#8){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline] #0: 00000000d8359dd9 (&type->i_mutex_dir_key#8){++++}, at: lookup_slow+0x43/0x70 fs/namei.c:1688 #1: 00000000c3b1dc1b (&fi->mutex){+.+.}, at: fuse_lock_inode+0x9a/0xc0 fs/fuse/inode.c:365 2 locks held by syz-executor.5/6525: #0: 00000000d09cbfe2 (&fc->killsb){.+.+}, at: fuse_notify_delete fs/fuse/dev.c:1573 [inline] #0: 00000000d09cbfe2 (&fc->killsb){.+.+}, at: fuse_notify fs/fuse/dev.c:1810 [inline] #0: 00000000d09cbfe2 (&fc->killsb){.+.+}, at: fuse_dev_do_write+0x19e0/0x2400 fs/fuse/dev.c:1885 #1: 00000000d8359dd9 (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #1: 00000000d8359dd9 (&type->i_mutex_dir_key#8){++++}, at: fuse_reverse_inval_entry+0x9a/0x5d0 fs/fuse/dir.c:987 1 lock held by syz-executor.5/6527: #0: 00000000d8359dd9 (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #0: 00000000d8359dd9 (&type->i_mutex_dir_key#8){++++}, at: lock_mount+0x82/0x290 fs/namespace.c:2039 1 lock held by syz-executor.5/6562: #0: 00000000d8359dd9 (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #0: 00000000d8359dd9 (&type->i_mutex_dir_key#8){++++}, at: lock_mount+0x82/0x290 fs/namespace.c:2039 1 lock held by syz-executor.5/6563: #0: 00000000d8359dd9 (&type->i_mutex_dir_key#8){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline] #0: 00000000d8359dd9 (&type->i_mutex_dir_key#8){++++}, at: lookup_slow+0x43/0x70 fs/namei.c:1688 2 locks held by syz-executor.1/6531: #0: 000000007d20cecc (&type->i_mutex_dir_key#8){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline] #0: 000000007d20cecc (&type->i_mutex_dir_key#8){++++}, at: lookup_slow+0x43/0x70 fs/namei.c:1688 #1: 00000000530eeec0 (&fi->mutex){+.+.}, at: fuse_lock_inode+0x9a/0xc0 fs/fuse/inode.c:365 2 locks held by syz-executor.1/6545: #0: 000000002207ab7c (&fc->killsb){.+.+}, at: fuse_notify_delete fs/fuse/dev.c:1573 [inline] #0: 000000002207ab7c (&fc->killsb){.+.+}, at: fuse_notify fs/fuse/dev.c:1810 [inline] #0: 000000002207ab7c (&fc->killsb){.+.+}, at: fuse_dev_do_write+0x19e0/0x2400 fs/fuse/dev.c:1885 #1: 000000007d20cecc (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #1: 000000007d20cecc (&type->i_mutex_dir_key#8){++++}, at: fuse_reverse_inval_entry+0x9a/0x5d0 fs/fuse/dir.c:987 1 lock held by syz-executor.1/6548: #0: 000000007d20cecc (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #0: 000000007d20cecc (&type->i_mutex_dir_key#8){++++}, at: lock_mount+0x82/0x290 fs/namespace.c:2039 1 lock held by syz-executor.1/6570: #0: 000000007d20cecc (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #0: 000000007d20cecc (&type->i_mutex_dir_key#8){++++}, at: lock_mount+0x82/0x290 fs/namespace.c:2039 1 lock held by syz-executor.1/6571: #0: 000000007d20cecc (&type->i_mutex_dir_key#8){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline] #0: 000000007d20cecc (&type->i_mutex_dir_key#8){++++}, at: lookup_slow+0x43/0x70 fs/namei.c:1688 2 locks held by syz-executor.0/6537: #0: 0000000045295249 (&type->i_mutex_dir_key#8){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline] #0: 0000000045295249 (&type->i_mutex_dir_key#8){++++}, at: lookup_slow+0x43/0x70 fs/namei.c:1688 #1: 00000000f38b60dd (&fi->mutex){+.+.}, at: fuse_lock_inode+0x9a/0xc0 fs/fuse/inode.c:365 1 lock held by syz-executor.0/6546: #0: 0000000045295249 (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #0: 0000000045295249 (&type->i_mutex_dir_key#8){++++}, at: lock_mount+0x82/0x290 fs/namespace.c:2039 2 locks held by syz-executor.0/6549: #0: 000000000c093916 (&fc->killsb){.+.+}, at: fuse_notify_delete fs/fuse/dev.c:1573 [inline] #0: 000000000c093916 (&fc->killsb){.+.+}, at: fuse_notify fs/fuse/dev.c:1810 [inline] #0: 000000000c093916 (&fc->killsb){.+.+}, at: fuse_dev_do_write+0x19e0/0x2400 fs/fuse/dev.c:1885 #1: 0000000045295249 (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #1: 0000000045295249 (&type->i_mutex_dir_key#8){++++}, at: fuse_reverse_inval_entry+0x9a/0x5d0 fs/fuse/dir.c:987 1 lock held by syz-executor.0/6575: #0: 0000000045295249 (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #0: 0000000045295249 (&type->i_mutex_dir_key#8){++++}, at: lock_mount+0x82/0x290 fs/namespace.c:2039 1 lock held by syz-executor.0/6576: #0: 0000000045295249 (&type->i_mutex_dir_key#8){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline] #0: 0000000045295249 (&type->i_mutex_dir_key#8){++++}, at: lookup_slow+0x43/0x70 fs/namei.c:1688 2 locks held by syz-executor.4/6540: #0: 00000000ec972963 (&type->i_mutex_dir_key#8){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline] #0: 00000000ec972963 (&type->i_mutex_dir_key#8){++++}, at: lookup_slow+0x43/0x70 fs/namei.c:1688 #1: 0000000094f969af (&fi->mutex){+.+.}, at: fuse_lock_inode+0x9a/0xc0 fs/fuse/inode.c:365 2 locks held by syz-executor.4/6547: #0: 0000000061d14d22 (&fc->killsb){.+.+}, at: fuse_notify_delete fs/fuse/dev.c:1573 [inline] #0: 0000000061d14d22 (&fc->killsb){.+.+}, at: fuse_notify fs/fuse/dev.c:1810 [inline] #0: 0000000061d14d22 (&fc->killsb){.+.+}, at: fuse_dev_do_write+0x19e0/0x2400 fs/fuse/dev.c:1885 #1: 00000000ec972963 (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #1: 00000000ec972963 (&type->i_mutex_dir_key#8){++++}, at: fuse_reverse_inval_entry+0x9a/0x5d0 fs/fuse/dir.c:987 1 lock held by syz-executor.4/6550: #0: 00000000ec972963 (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #0: 00000000ec972963 (&type->i_mutex_dir_key#8){++++}, at: lock_mount+0x82/0x290 fs/namespace.c:2039 1 lock held by syz-executor.4/6581: #0: 00000000ec972963 (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #0: 00000000ec972963 (&type->i_mutex_dir_key#8){++++}, at: lock_mount+0x82/0x290 fs/namespace.c:2039 1 lock held by syz-executor.4/6582: #0: 00000000ec972963 (&type->i_mutex_dir_key#8){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline] #0: 00000000ec972963 (&type->i_mutex_dir_key#8){++++}, at: lookup_slow+0x43/0x70 fs/namei.c:1688 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1042 Comm: khungtaskd Not tainted 4.19.192-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+0x123/0x171 lib/dump_stack.c:118 nmi_cpu_backtrace.cold.4+0x3e/0x76 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0xe6/0x120 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 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0x12/0x20 arch/x86/include/asm/irqflags.h:60