INFO: task syz-executor.4:12569 can't die for more than 143 seconds. task:syz-executor.4 state:R running task stack:27208 pid:12569 ppid: 8397 flags:0x00004006 Call Trace: context_switch syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/sched/core.c:4326 [inline] __schedule+0x90c/0x21a0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/sched/core.c:5077 preempt_schedule_common+0x45/0xc0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/sched/core.c:5237 preempt_schedule_thunk+0x16/0x18 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/arch/x86/entry/thunk_64.S:35 __raw_spin_unlock syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/./include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock+0x36/0x40 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/locking/spinlock.c:183 spin_unlock syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/./include/linux/spinlock.h:394 [inline] ilookup5_nowait syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/inode.c:1336 [inline] ilookup5 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/inode.c:1364 [inline] iget5_locked+0xcc/0x2d0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/inode.c:1145 fuse_iget+0x271/0x610 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/fuse/inode.c:342 fuse_lookup_name+0x447/0x630 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/fuse/dir.c:439 fuse_lookup.part.0+0xdf/0x390 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/fuse/dir.c:469 fuse_lookup+0x70/0x90 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/fuse/dir.c:465 __lookup_slow+0x24c/0x480 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namei.c:1625 lookup_slow syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namei.c:1642 [inline] walk_component+0x418/0x6a0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namei.c:1939 lookup_last syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namei.c:2396 [inline] path_lookupat+0x1ba/0x830 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namei.c:2420 filename_lookup+0x19f/0x560 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namei.c:2453 user_path_at syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/./include/linux/namei.h:60 [inline] do_mount syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:3243 [inline] __do_sys_mount syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:3454 [inline] __se_sys_mount syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:3431 [inline] __x64_sys_mount+0x1ea/0x300 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:3431 do_syscall_64+0x2d/0x70 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x465b09 RSP: 002b:00007f7da5932188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465b09 RDX: 0000000000000000 RSI: 0000000020004240 RDI: 0000000000000000 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffe2fcae2df R14: 00007f7da5932300 R15: 0000000000022000 INFO: task syz-executor.4:12572 can't die for more than 144 seconds. task:syz-executor.4 state:D stack:27680 pid:12572 ppid: 8397 flags:0x00004004 Call Trace: context_switch syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/sched/core.c:4326 [inline] __schedule+0x90c/0x21a0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/sched/core.c:5077 schedule+0xcf/0x270 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/sched/core.c:5156 rwsem_down_write_slowpath+0x7e5/0x1200 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/locking/rwsem.c:1106 __down_write_common syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/locking/rwsem.c:1261 [inline] __down_write_common syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/locking/rwsem.c:1258 [inline] __down_write syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/locking/rwsem.c:1270 [inline] down_write+0x132/0x150 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/locking/rwsem.c:1407 inode_lock syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/./include/linux/fs.h:775 [inline] lock_mount+0x8a/0x2e0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:2216 do_new_mount_fc syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:2846 [inline] do_new_mount syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:2905 [inline] path_mount+0x14d6/0x1f90 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:3233 do_mount syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:3246 [inline] __do_sys_mount syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:3454 [inline] __se_sys_mount syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:3431 [inline] __x64_sys_mount+0x27f/0x300 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:3431 do_syscall_64+0x2d/0x70 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x465b09 RSP: 002b:00007f7da5911188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000465b09 RDX: 0000000020002000 RSI: 00000000200042c0 RDI: 0000000000000000 RBP: 00000000004b069f R08: 0000000020002140 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c008 R13: 00007ffe2fcae2df R14: 00007f7da5911300 R15: 0000000000022000 INFO: task syz-executor.4:12572 blocked for more than 144 seconds. Not tainted 5.11.0-rc6-next-20210205-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:27680 pid:12572 ppid: 8397 flags:0x00004004 Call Trace: context_switch syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/sched/core.c:4326 [inline] __schedule+0x90c/0x21a0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/sched/core.c:5077 schedule+0xcf/0x270 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/sched/core.c:5156 rwsem_down_write_slowpath+0x7e5/0x1200 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/locking/rwsem.c:1106 __down_write_common syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/locking/rwsem.c:1261 [inline] __down_write_common syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/locking/rwsem.c:1258 [inline] __down_write syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/locking/rwsem.c:1270 [inline] down_write+0x132/0x150 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/locking/rwsem.c:1407 inode_lock syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/./include/linux/fs.h:775 [inline] lock_mount+0x8a/0x2e0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:2216 do_new_mount_fc syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:2846 [inline] do_new_mount syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:2905 [inline] path_mount+0x14d6/0x1f90 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:3233 do_mount syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:3246 [inline] __do_sys_mount syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:3454 [inline] __se_sys_mount syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:3431 [inline] __x64_sys_mount+0x27f/0x300 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:3431 do_syscall_64+0x2d/0x70 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x465b09 RSP: 002b:00007f7da5911188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000465b09 RDX: 0000000020002000 RSI: 00000000200042c0 RDI: 0000000000000000 RBP: 00000000004b069f R08: 0000000020002140 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c008 R13: 00007ffe2fcae2df R14: 00007f7da5911300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1667: #0: ffffffff8bf6f820 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/locking/lockdep.c:6326 1 lock held by in:imklog/8099: #0: ffff88801c3ab270 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/file.c:961 2 locks held by syz-executor.4/12569: 1 lock held by syz-executor.4/12572: #0: ffff888070390150 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/./include/linux/fs.h:775 [inline] #0: ffff888070390150 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lock_mount+0x8a/0x2e0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:2216 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1667 Comm: khungtaskd Not tainted 5.11.0-rc6-next-20210205-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x44/0xd7 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/./include/linux/nmi.h:147 [inline] check_hung_uninterruptible_tasks syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/hung_task.c:253 [inline] watchdog+0xd89/0xf30 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/hung_task.c:338 kthread+0x3b1/0x4a0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/kthread.c:292 ret_from_fork+0x1f/0x30 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/arch/x86/entry/entry_64.S:296 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4824 Comm: systemd-journal Not tainted 5.11.0-rc6-next-20210205-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0033:0x7f24a63d2cc2 Code: 6f 4f de f3 0f 6f 56 de b2 de 66 0f ef d1 66 0f 38 17 c2 0f 83 b7 08 00 00 48 8b 47 ee 48 8b 4e ee 48 39 c1 0f 85 c1 08 00 00 <48> 8b 47 f6 48 8b 4e f6 48 39 c1 0f 85 b0 08 00 00 0f b7 47 fe 0f RSP: 002b:00007fffb3144b18 EFLAGS: 00000203 RAX: 000000000000004a RBX: 000055e8a9270e80 RCX: 00007f24a63d2cc2 RDX: 000000000000000a RSI: 000055e8a927109a RDI: 00007f24a435b19a RBP: ac8bc31478ec8511 R08: 000000000012e19a R09: 000055e8a9271120 R10: 00007f24a6dc8ee8 R11: 00007f24a63f8060 R12: 00007fffb3144b68 R13: 000000000000000a R14: 000000000012e150 R15: 000055e8a9271090 FS: 00007f24a70ae8c0 GS: 0000000000000000