INFO: task syz-executor.0:13813 can't die for more than 143 seconds. task:syz-executor.0 state:D stack:28024 pid:13813 ppid: 6844 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x8e5/0x21e0 kernel/sched/core.c:4527 schedule+0xd0/0x2a0 kernel/sched/core.c:4602 request_wait_answer+0x458/0x7f0 fs/fuse/dev.c:402 __fuse_request_send fs/fuse/dev.c:421 [inline] fuse_simple_request+0x526/0xbf0 fs/fuse/dev.c:503 fuse_listxattr+0x2d8/0x4e0 fs/fuse/xattr.c:139 vfs_listxattr+0x105/0x190 fs/xattr.c:420 listxattr+0x70/0x180 fs/xattr.c:715 path_listxattr+0xae/0x140 fs/xattr.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d5b9 Code: Bad RIP value. RSP: 002b:00007feb9d395c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000c3 RAX: ffffffffffffffda RBX: 0000000000020480 RCX: 000000000045d5b9 RDX: 0000000000000038 RSI: 00000000200001c0 RDI: 0000000020000180 RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007ffcc5c2d04f R14: 00007feb9d3969c0 R15: 000000000118cf4c INFO: task syz-executor.0:13813 blocked for more than 143 seconds. Not tainted 5.9.0-rc2-next-20200828-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:28024 pid:13813 ppid: 6844 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x8e5/0x21e0 kernel/sched/core.c:4527 schedule+0xd0/0x2a0 kernel/sched/core.c:4602 request_wait_answer+0x458/0x7f0 fs/fuse/dev.c:402 __fuse_request_send fs/fuse/dev.c:421 [inline] fuse_simple_request+0x526/0xbf0 fs/fuse/dev.c:503 fuse_listxattr+0x2d8/0x4e0 fs/fuse/xattr.c:139 vfs_listxattr+0x105/0x190 fs/xattr.c:420 listxattr+0x70/0x180 fs/xattr.c:715 path_listxattr+0xae/0x140 fs/xattr.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d5b9 Code: Bad RIP value. RSP: 002b:00007feb9d395c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000c3 RAX: ffffffffffffffda RBX: 0000000000020480 RCX: 000000000045d5b9 RDX: 0000000000000038 RSI: 00000000200001c0 RDI: 0000000020000180 RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007ffcc5c2d04f R14: 00007feb9d3969c0 R15: 000000000118cf4c Showing all locks held in the system: 2 locks held by kworker/u4:4/155: #0: ffff8880ae635f98 (&rq->lock){-.-.}-{2:2}, at: newidle_balance+0x77f/0xe30 kernel/sched/fair.c:10555 #1: ffffffff89c67640 (rcu_read_lock){....}-{1:2}, at: cpu_of kernel/sched/sched.h:1072 [inline] #1: ffffffff89c67640 (rcu_read_lock){....}-{1:2}, at: __update_idle_core+0x39/0x3e0 kernel/sched/fair.c:6014 1 lock held by khungtaskd/1175: #0: ffffffff89c67640 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5825 1 lock held by in:imklog/6527: #0: ffff8880a90f2df0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:930 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1175 Comm: khungtaskd Not tainted 5.9.0-rc2-next-20200828-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+0x18f/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x223 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:147 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:253 [inline] watchdog+0xd89/0xf30 kernel/hung_task.c:339 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 3894 Comm: systemd-journal Not tainted 5.9.0-rc2-next-20200828-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0033:0x7ff015bbc073 Code: d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 90 66 2e 0f 1f 84 00 00 00 00 00 48 89 85 58 ff ff ff 48 c1 e0 04 4c 8d 6b 08 48 83 c0 1e <4c> 8d 75 a0 48 c1 e8 04 48 c1 e0 04 48 29 c4 48 8d 44 24 0f 48 83 RSP: 002b:00007fffa56efaf0 EFLAGS: 00000202 RAX: 00000000000000ae RBX: 00007fffa56f0040 RCX: 0000000000000009 RDX: 00007fffa56f0040 RSI: 0005ae1b880115e6 RDI: 000055bba8e6ce80 RBP: 00007fffa56efba0 R08: 00007fffa56f2ae0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000055bba8e6ce80 R13: 00007fffa56f0048 R14: 00007fffa56f2a30 R15: 00007fffa56f0040 FS: 00007ff015ec98c0 GS: 0000000000000000