INFO: task syz-executor.5:29069 can't die for more than 143 seconds. task:syz-executor.5 state:D stack:27312 pid:29069 ppid: 8527 flags:0x00004004 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:00007f5607498c68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045e219 RDX: 0000000020002000 RSI: 00000000200042c0 RDI: 0000000000000000 RBP: 000000000119bfd0 R08: 0000000020002140 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffef66243ff R14: 00007f56074999c0 R15: 000000000119bf8c INFO: task syz-executor.5:29069 blocked for more than 143 seconds. Not tainted 5.11.0-rc2-next-20210107-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:27312 pid:29069 ppid: 8527 flags:0x00004004 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:00007f5607498c68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045e219 RDX: 0000000020002000 RSI: 00000000200042c0 RDI: 0000000000000000 RBP: 000000000119bfd0 R08: 0000000020002140 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffef66243ff R14: 00007f56074999c0 R15: 000000000119bf8c INFO: task syz-executor.5:29077 can't die for more than 144 seconds. task:syz-executor.5 state:R running task stack:27472 pid:29077 ppid: 8527 flags:0x00004006 Call Trace: Showing all locks held in the system: 1 lock held by khungtaskd/1650: #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/8181: #0: ffff88802553d770 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:947 1 lock held by syz-executor.5/29069: #0: ffff888078d50810 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:773 [inline] #0: ffff888078d50810 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lock_mount+0x8a/0x2e0 fs/namespace.c:2204 2 locks held by syz-executor.5/29077: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1650 Comm: khungtaskd Not tainted 5.11.0-rc2-next-20210107-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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 8181 Comm: in:imklog Not tainted 5.11.0-rc2-next-20210107-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:49 [inline] RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:89 [inline] RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:121 [inline] RIP: 0010:lock_is_held_type+0x25/0x100 kernel/locking/lockdep.c:5472 Code: 00 00 00 00 00 41 57 41 56 41 89 f6 41 55 41 54 55 48 89 fd 53 48 83 ec 08 e8 57 45 6a f8 84 c0 0f 84 b8 00 00 00 9c 8f 04 24 48 c7 c7 a0 a2 4b 89 31 db e8 bc 0b 00 00 65 4c 8b 24 25 00 f0 RSP: 0018:ffffc9000b71f980 EFLAGS: 00000002 RAX: 0000000000000001 RBX: ffff888013e4d4c0 RCX: 1ffffffff19dfe83 RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffff88801eb85d8c RBP: ffffffff8b363de0 R08: 0000000000000000 R09: ffffffff8cefc24f R10: fffffbfff19df849 R11: 0000000000000000 R12: 0000000000000001 R13: 0000000000000000 R14: 00000000ffffffff R15: ffff88801ac800c0 FS: 00007f097565b700(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fef1ccbf010 CR3: 0000000014132000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: lock_is_held include/linux/lockdep.h:271 [inline] rcu_read_lock_sched_held+0x3a/0x70 kernel/rcu/update.c:125 trace_sched_stat_runtime include/trace/events/sched.h:519 [inline] update_curr+0x715/0x840 kernel/sched/fair.c:869 enqueue_entity+0x435/0x2080 kernel/sched/fair.c:4217 enqueue_task_fair+0x1d8/0x1a70 kernel/sched/fair.c:5522 enqueue_task kernel/sched/core.c:1596 [inline] activate_task kernel/sched/core.c:1615 [inline] ttwu_do_activate+0x185/0x660 kernel/sched/core.c:2986 ttwu_queue kernel/sched/core.c:3176 [inline] try_to_wake_up+0x58a/0x13b0 kernel/sched/core.c:3454 wake_up_process kernel/sched/core.c:3523 [inline] wake_up_q+0x96/0x100 kernel/sched/core.c:589 futex_wake_op kernel/futex.c:1759 [inline] do_futex+0x12c9/0x1960 kernel/futex.c:3774 __do_sys_futex+0x2a2/0x470 kernel/futex.c:3826 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f0977c9b845 Code: 00 00 00 74 17 49 8b 48 20 44 8b 59 10 41 83 e3 30 41 83 fb 20 74 1e be 85 00 00 00 41 ba 01 00 00 00 41 b9 01 00 00 04 0f 05 <48> 3d 01 f0 ff ff 73 1f 31 c0 c3 be 8c 00 00 00 49 89 c8 4d 31 d2 RSP: 002b:00007f097563a3a8 EFLAGS: 00000283 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0977c9b845 RDX: 0000000000000001 RSI: 0000000000000085 RDI: 000055d58996728c RBP: 0000000000000001 R08: 000055d589967288 R09: 0000000004000001 R10: 0000000000000001 R11: 0000000000000283 R12: 0000000000000000 R13: 0000000000000001 R14: 000055d589671770 R15: 000055d5899670e0