audit: type=1800 audit(1612586629.593:673): pid=18368 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed comm="syz-executor.3" name="SYSV00000000" dev="hugetlbfs" ino=12189861 res=0 audit: type=1800 audit(1612586629.633:674): pid=18368 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed comm="syz-executor.3" name="SYSV00000000" dev="hugetlbfs" ino=12255398 res=0 INFO: task syz-executor.5:18354 blocked for more than 140 seconds. Not tainted 4.19.172-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28296 18354 8135 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 request_wait_answer+0x3dc/0x750 fs/fuse/dev.c:485 __fuse_request_send+0x123/0x1c0 fs/fuse/dev.c:505 fuse_simple_request+0x2e6/0x820 fs/fuse/dev.c:576 fuse_lookup_name+0x24c/0x5c0 fs/fuse/dir.c:330 fuse_lookup+0xdf/0x410 fs/fuse/dir.c:368 fuse_atomic_open+0x20a/0x330 fs/fuse/dir.c:508 atomic_open fs/namei.c:3073 [inline] lookup_open+0x1023/0x1a20 fs/namei.c:3205 do_last fs/namei.c:3327 [inline] path_openat+0x1804/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_sys_open+0x3b3/0x520 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465b09 Code: Bad RIP value. RSP: 002b:00007fb0ff3b9188 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465b09 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020003600 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffda5c3e6af R14: 00007fb0ff3b9300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1568: #0: 00000000c88d8ee2 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4440 1 lock held by in:imklog/7810: #0: 000000001771756b (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 3 locks held by kworker/u4:6/8063: 2 locks held by syz-executor.5/18354: #0: 00000000e401d4be (&type->i_mutex_dir_key#8){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline] #0: 00000000e401d4be (&type->i_mutex_dir_key#8){++++}, at: do_last fs/namei.c:3326 [inline] #0: 00000000e401d4be (&type->i_mutex_dir_key#8){++++}, at: path_openat+0x17ec/0x2df0 fs/namei.c:3537 #1: 00000000b0918f45 (&fi->mutex){+.+.}, at: fuse_lock_inode+0xaf/0xe0 fs/fuse/inode.c:365 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1568 Comm: khungtaskd Not tainted 4.19.172-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+0x1fc/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 kthread+0x33f/0x460 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: 4689 Comm: systemd-journal Not tainted 4.19.172-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:arch_atomic_inc arch/x86/include/asm/atomic.h:97 [inline] RIP: 0010:atomic_inc include/asm-generic/atomic-instrumented.h:110 [inline] RIP: 0010:__lock_acquire+0x256/0x3ff0 kernel/locking/lockdep.c:3307 Code: 00 49 8b 44 c6 08 48 85 c0 0f 84 38 ff ff ff 48 8d b8 38 01 00 00 be 04 00 00 00 48 89 44 24 10 e8 bf 20 4d 00 48 8b 44 24 10 ff 80 38 01 00 00 49 8d b5 80 08 00 00 48 ba 00 00 00 00 00 fc RSP: 0018:ffff8880a0f2f8e8 EFLAGS: 00000046 RAX: ffffffff8cd5b090 RBX: 0000000000000000 RCX: ffffffff814add11 RDX: fffffbfff19ab63a RSI: 0000000000000004 RDI: ffffffff8cd5b1c8 RBP: 0000000000000002 R08: 0000000000000001 R09: fffffbfff19ab639 R10: ffffffff8cd5b1cb R11: 0000000000000000 R12: 0000000000000000 R13: ffff8880a0f224c0 R14: ffffffff89f85de0 R15: 0000000000000000 FS: 00007f2be2c428c0(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2bde773008 CR3: 00000000a0d15000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3907 rcu_lock_acquire include/linux/rcupdate.h:242 [inline] rcu_read_lock include/linux/rcupdate.h:627 [inline] path_init+0xb76/0x19d0 fs/namei.c:2180 path_lookupat+0x97/0x8d0 fs/namei.c:2309 filename_lookup+0x1ac/0x5a0 fs/namei.c:2349 user_path_at include/linux/namei.h:57 [inline] do_faccessat+0x248/0x7a0 fs/open.c:397 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f2be1efe9c7 Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007ffc1234c768 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00007ffc1234f680 RCX: 00007f2be1efe9c7 RDX: 00007f2be296fa00 RSI: 0000000000000000 RDI: 000055581ed129a3 RBP: 00007ffc1234c7a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ffc1234f680 R15: 00007ffc1234cc90