INFO: task syz-executor.3:10340 can't die for more than 143 seconds. task:syz-executor.3 state:D stack:27448 pid:10340 ppid: 8506 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4312 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5063 schedule+0xcf/0x270 kernel/sched/core.c:5142 rwsem_down_write_slowpath+0x7e5/0x1200 kernel/locking/rwsem.c:1106 __down_write_common kernel/locking/rwsem.c:1261 [inline] __down_write_common kernel/locking/rwsem.c:1258 [inline] __down_write kernel/locking/rwsem.c:1270 [inline] down_write+0x132/0x150 kernel/locking/rwsem.c:1407 inode_lock include/linux/fs.h:773 [inline] lock_mount+0x8a/0x2e0 fs/namespace.c:2204 do_new_mount_fc fs/namespace.c:2832 [inline] do_new_mount fs/namespace.c:2891 [inline] path_mount+0x1678/0x1e70 fs/namespace.c:3220 do_mount fs/namespace.c:3233 [inline] __do_sys_mount fs/namespace.c:3441 [inline] __se_sys_mount fs/namespace.c:3418 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3418 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 RSP: 002b:00007f14a7b9bc68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045e219 RDX: 0000000020002000 RSI: 00000000200042c0 RDI: 0000000000000000 RBP: 000000000119bfd0 R08: 00000000200021c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007fff523a1e9f R14: 00007f14a7b9c9c0 R15: 000000000119bf8c INFO: task syz-executor.3:10340 blocked for more than 143 seconds. Not tainted 5.11.0-rc2-next-20210108-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:27448 pid:10340 ppid: 8506 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4312 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5063 schedule+0xcf/0x270 kernel/sched/core.c:5142 rwsem_down_write_slowpath+0x7e5/0x1200 kernel/locking/rwsem.c:1106 __down_write_common kernel/locking/rwsem.c:1261 [inline] __down_write_common kernel/locking/rwsem.c:1258 [inline] __down_write kernel/locking/rwsem.c:1270 [inline] down_write+0x132/0x150 kernel/locking/rwsem.c:1407 inode_lock include/linux/fs.h:773 [inline] lock_mount+0x8a/0x2e0 fs/namespace.c:2204 do_new_mount_fc fs/namespace.c:2832 [inline] do_new_mount fs/namespace.c:2891 [inline] path_mount+0x1678/0x1e70 fs/namespace.c:3220 do_mount fs/namespace.c:3233 [inline] __do_sys_mount fs/namespace.c:3441 [inline] __se_sys_mount fs/namespace.c:3418 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3418 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 RSP: 002b:00007f14a7b9bc68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045e219 RDX: 0000000020002000 RSI: 00000000200042c0 RDI: 0000000000000000 RBP: 000000000119bfd0 R08: 00000000200021c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007fff523a1e9f R14: 00007f14a7b9c9c0 R15: 000000000119bf8c INFO: task syz-executor.3:10351 can't die for more than 144 seconds. task:syz-executor.3 state:R running task stack:27472 pid:10351 ppid: 8506 flags:0x00004006 Call Trace: Showing all locks held in the system: 3 locks held by kworker/u4:2/28: #0: ffff8880b9f34fd8 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1319 [inline] #0: ffff8880b9f34fd8 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x217/0x21a0 kernel/sched/core.c:4980 #1: ffffc90000e3fda8 ((work_completion)(&(&bat_priv->nc.work)->work)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 kernel/workqueue.c:2250 #2: ffff8880b9f24918 (&base->lock){..-.}-{2:2}, at: lock_timer_base+0x5a/0x1f0 kernel/time/timer.c:944 1 lock held by khungtaskd/1665: #0: ffffffff8b363ea0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6254 1 lock held by in:imklog/8185: #0: ffff88801342ed70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:947 1 lock held by syz-executor.3/10340: #0: ffff888031fa3090 (&type->i_mutex_dir_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:773 [inline] #0: ffff888031fa3090 (&type->i_mutex_dir_key#9){++++}-{3:3}, at: lock_mount+0x8a/0x2e0 fs/namespace.c:2204 2 locks held by syz-executor.3/10351: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1665 Comm: khungtaskd Not tainted 5.11.0-rc2-next-20210108-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 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:338 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 10351 Comm: syz-executor.3 Not tainted 5.11.0-rc2-next-20210108-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__sanitizer_cov_trace_pc+0x4c/0x60 kernel/kcov.c:202 Code: 0e 85 c9 74 35 8b 82 d4 14 00 00 85 c0 74 2b 8b 82 b0 14 00 00 83 f8 02 75 20 48 8b 8a b8 14 00 00 8b 92 b4 14 00 00 48 8b 01 <48> 83 c0 01 48 39 c2 76 07 48 89 34 c1 48 89 01 c3 0f 1f 00 41 55 RSP: 0018:ffffc90016ed7628 EFLAGS: 00000246 RAX: 000000000003ffff RBX: ffff888031fa3148 RCX: ffffc9000f69a000 RDX: 0000000000040000 RSI: ffffffff83d641a1 RDI: ffff888031fa3148 RBP: ffff888031fa2fc8 R08: 0000000000000000 R09: ffff888031fa33ff R10: ffffffff81c7f076 R11: 0000000000000000 R12: ffffc90016ed7990 R13: ffff888023926000 R14: ffff888031fa2fc8 R15: ffffc90016ed7718 FS: 00007f14a7b7b700(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f543770e000 CR3: 0000000027864000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: _atomic_dec_and_lock+0x11/0x100 include/linux/instrumented.h:101 iput.part.0+0x67/0x810 fs/inode.c:1672 iput+0x58/0x70 fs/inode.c:1670 fuse_iget+0x24e/0x610 fs/fuse/inode.c:356 fuse_lookup_name+0x447/0x630 fs/fuse/dir.c:439 fuse_lookup.part.0+0xdf/0x390 fs/fuse/dir.c:469 fuse_lookup+0x70/0x90 fs/fuse/dir.c:465 __lookup_slow+0x24c/0x480 fs/namei.c:1549 lookup_slow fs/namei.c:1566 [inline] walk_component+0x418/0x6a0 fs/namei.c:1861 lookup_last fs/namei.c:2316 [inline] path_lookupat+0x1ba/0x830 fs/namei.c:2340 filename_lookup+0x19f/0x560 fs/namei.c:2373 user_path_at include/linux/namei.h:60 [inline] do_mount fs/namespace.c:3230 [inline] __do_sys_mount fs/namespace.c:3441 [inline] __se_sys_mount fs/namespace.c:3418 [inline] __x64_sys_mount+0x1ea/0x300 fs/namespace.c:3418 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f14a7b7ac68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045e219 RDX: 0000000000000000 RSI: 00000000200020c0 RDI: 0000000000000000 RBP: 000000000119c078 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c034 R13: 00007fff523a1e9f R14: 00007f14a7b7b9c0 R15: 000000000119c034