Bluetooth: hci3 command 0x0406 tx timeout Bluetooth: hci2 command 0x0406 tx timeout Bluetooth: hci0 command 0x0406 tx timeout Bluetooth: hci4 command 0x0406 tx timeout Bluetooth: hci5 command 0x0406 tx timeout INFO: task syz-executor.2:9639 blocked for more than 140 seconds. Not tainted 4.14.226-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D29008 9639 8291 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x824/0x1ee0 kernel/sched/core.c:3384 schedule+0x7f/0x1b0 kernel/sched/core.c:3428 wb_wait_for_completion fs/fs-writeback.c:222 [inline] wb_wait_for_completion+0x11a/0x170 fs/fs-writeback.c:218 sync_inodes_sb+0x16e/0x8b0 fs/fs-writeback.c:2464 __sync_filesystem fs/sync.c:34 [inline] sync_filesystem fs/sync.c:67 [inline] sync_filesystem+0x107/0x1f0 fs/sync.c:48 nilfs_remount+0x50/0x450 fs/nilfs2/super.c:1129 do_remount_sb+0x154/0x630 fs/super.c:868 do_remount fs/namespace.c:2370 [inline] do_mount+0x1031/0x2af0 fs/namespace.c:2870 SYSC_mount fs/namespace.c:3095 [inline] SyS_mount+0xb1/0xd0 fs/namespace.c:3072 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x465b09 RSP: 002b:00007f305c69d188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000465b09 RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000000 RBP: 00000000004b069f R08: 0000000020000440 R09: 0000000000000000 R10: 0000000000000020 R11: 0000000000000246 R12: 000000000056c008 R13: 00007fff4d5cc64f R14: 00007f305c69d300 R15: 0000000000022000 INFO: task syz-executor.3:9724 blocked for more than 140 seconds. Not tainted 4.14.226-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D29176 9724 8288 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x824/0x1ee0 kernel/sched/core.c:3384 schedule+0x7f/0x1b0 kernel/sched/core.c:3428 wb_wait_for_completion fs/fs-writeback.c:222 [inline] wb_wait_for_completion+0x11a/0x170 fs/fs-writeback.c:218 sync_inodes_sb+0x16e/0x8b0 fs/fs-writeback.c:2464 __sync_filesystem fs/sync.c:34 [inline] sync_filesystem fs/sync.c:67 [inline] sync_filesystem+0x107/0x1f0 fs/sync.c:48 nilfs_remount+0x50/0x450 fs/nilfs2/super.c:1129 do_remount_sb+0x154/0x630 fs/super.c:868 do_remount fs/namespace.c:2370 [inline] do_mount+0x1031/0x2af0 fs/namespace.c:2870 SYSC_mount fs/namespace.c:3095 [inline] SyS_mount+0xb1/0xd0 fs/namespace.c:3072 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x465b09 RSP: 002b:00007f2dd9ce7188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000465b09 RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000000 RBP: 00000000004b069f R08: 0000000020000440 R09: 0000000000000000 R10: 0000000000000020 R11: 0000000000000246 R12: 000000000056c008 R13: 00007ffe7a268dcf R14: 00007f2dd9ce7300 R15: 0000000000022000 INFO: task syz-executor.5:9775 blocked for more than 140 seconds. Not tainted 4.14.226-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D29176 9775 8286 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x824/0x1ee0 kernel/sched/core.c:3384 schedule+0x7f/0x1b0 kernel/sched/core.c:3428 wb_wait_for_completion fs/fs-writeback.c:222 [inline] wb_wait_for_completion+0x11a/0x170 fs/fs-writeback.c:218 sync_inodes_sb+0x16e/0x8b0 fs/fs-writeback.c:2464 __sync_filesystem fs/sync.c:34 [inline] sync_filesystem fs/sync.c:67 [inline] sync_filesystem+0x107/0x1f0 fs/sync.c:48 nilfs_remount+0x50/0x450 fs/nilfs2/super.c:1129 do_remount_sb+0x154/0x630 fs/super.c:868 do_remount fs/namespace.c:2370 [inline] do_mount+0x1031/0x2af0 fs/namespace.c:2870 SYSC_mount fs/namespace.c:3095 [inline] SyS_mount+0xb1/0xd0 fs/namespace.c:3072 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x465b09 RSP: 002b:00007f88416f6188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000465b09 RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000000 RBP: 00000000004b069f R08: 0000000020000440 R09: 0000000000000000 R10: 0000000000000020 R11: 0000000000000246 R12: 000000000056c008 R13: 00007fffa4006a5f R14: 00007f88416f6300 R15: 0000000000022000 INFO: task syz-executor.4:9804 blocked for more than 140 seconds. Not tainted 4.14.226-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D29064 9804 8290 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x824/0x1ee0 kernel/sched/core.c:3384 schedule+0x7f/0x1b0 kernel/sched/core.c:3428 wb_wait_for_completion fs/fs-writeback.c:222 [inline] wb_wait_for_completion+0x11a/0x170 fs/fs-writeback.c:218 sync_inodes_sb+0x16e/0x8b0 fs/fs-writeback.c:2464 __sync_filesystem fs/sync.c:34 [inline] sync_filesystem fs/sync.c:67 [inline] sync_filesystem+0x107/0x1f0 fs/sync.c:48 nilfs_remount+0x50/0x450 fs/nilfs2/super.c:1129 do_remount_sb+0x154/0x630 fs/super.c:868 do_remount fs/namespace.c:2370 [inline] do_mount+0x1031/0x2af0 fs/namespace.c:2870 SYSC_mount fs/namespace.c:3095 [inline] SyS_mount+0xb1/0xd0 fs/namespace.c:3072 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x465b09 RSP: 002b:00007f6ec38aa188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000465b09 RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000000 RBP: 00000000004b069f R08: 0000000020000440 R09: 0000000000000000 R10: 0000000000000020 R11: 0000000000000246 R12: 000000000056c008 R13: 00007ffe7063605f R14: 00007f6ec38aa300 R15: 0000000000022000 INFO: task syz-executor.0:9825 blocked for more than 140 seconds. Not tainted 4.14.226-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D29176 9825 8284 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x824/0x1ee0 kernel/sched/core.c:3384 schedule+0x7f/0x1b0 kernel/sched/core.c:3428 wb_wait_for_completion fs/fs-writeback.c:222 [inline] wb_wait_for_completion+0x11a/0x170 fs/fs-writeback.c:218 sync_inodes_sb+0x16e/0x8b0 fs/fs-writeback.c:2464 __sync_filesystem fs/sync.c:34 [inline] sync_filesystem fs/sync.c:67 [inline] sync_filesystem+0x107/0x1f0 fs/sync.c:48 nilfs_remount+0x50/0x450 fs/nilfs2/super.c:1129 do_remount_sb+0x154/0x630 fs/super.c:868 do_remount fs/namespace.c:2370 [inline] do_mount+0x1031/0x2af0 fs/namespace.c:2870 SYSC_mount fs/namespace.c:3095 [inline] SyS_mount+0xb1/0xd0 fs/namespace.c:3072 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x465b09 RSP: 002b:00007f4512c40188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000465b09 RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000000 RBP: 00000000004b069f R08: 0000000020000440 R09: 0000000000000000 R10: 0000000000000020 R11: 0000000000000246 R12: 000000000056c008 R13: 00007ffee8187f8f R14: 00007f4512c40300 R15: 0000000000022000 INFO: task syz-executor.1:9842 blocked for more than 140 seconds. Not tainted 4.14.226-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D29176 9842 8283 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x824/0x1ee0 kernel/sched/core.c:3384 schedule+0x7f/0x1b0 kernel/sched/core.c:3428 wb_wait_for_completion fs/fs-writeback.c:222 [inline] wb_wait_for_completion+0x11a/0x170 fs/fs-writeback.c:218 sync_inodes_sb+0x16e/0x8b0 fs/fs-writeback.c:2464 __sync_filesystem fs/sync.c:34 [inline] sync_filesystem fs/sync.c:67 [inline] sync_filesystem+0x107/0x1f0 fs/sync.c:48 nilfs_remount+0x50/0x450 fs/nilfs2/super.c:1129 do_remount_sb+0x154/0x630 fs/super.c:868 do_remount fs/namespace.c:2370 [inline] do_mount+0x1031/0x2af0 fs/namespace.c:2870 SYSC_mount fs/namespace.c:3095 [inline] SyS_mount+0xb1/0xd0 fs/namespace.c:3072 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x465b09 RSP: 002b:00007fcb4d9f2188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000465b09 RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000000 RBP: 00000000004b069f R08: 0000000020000440 R09: 0000000000000000 R10: 0000000000000020 R11: 0000000000000246 R12: 000000000056c008 R13: 00007ffc51e22f7f R14: 00007fcb4d9f2300 R15: 0000000000022000 Showing all locks held in the system: 2 locks held by kworker/u4:0/5: #0: ("writeback"){+.+.}, at: [] process_one_work+0x681/0x1620 kernel/workqueue.c:2087 #1: ((&(&wb->dwork)->work)){+.+.}, at: [] process_one_work+0x6b4/0x1620 kernel/workqueue.c:2091 2 locks held by kworker/u4:2/131: #0: ("writeback"){+.+.}, at: [] process_one_work+0x681/0x1620 kernel/workqueue.c:2087 #1: ((&(&wb->dwork)->work)){+.+.}, at: [] process_one_work+0x6b4/0x1620 kernel/workqueue.c:2091 2 locks held by kworker/u4:3/222: #0: ("writeback"){+.+.}, at: [] process_one_work+0x681/0x1620 kernel/workqueue.c:2087 #1: ((&(&wb->dwork)->work)){+.+.}, at: [] process_one_work+0x6b4/0x1620 kernel/workqueue.c:2091 1 lock held by khungtaskd/1530: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4548 2 locks held by kworker/u4:4/2861: #0: ("writeback"){+.+.}, at: [] process_one_work+0x681/0x1620 kernel/workqueue.c:2087 #1: ((&(&wb->dwork)->work)){+.+.}, at: [] process_one_work+0x6b4/0x1620 kernel/workqueue.c:2091 1 lock held by in:imklog/7658: #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x8e/0xc0 fs/file.c:769 2 locks held by syz-executor.2/9639: #0: (&type->s_umount_key#49){+.+.}, at: [] do_remount fs/namespace.c:2364 [inline] #0: (&type->s_umount_key#49){+.+.}, at: [] do_mount+0x769/0x2af0 fs/namespace.c:2870 #1: (&bdi->wb_switch_rwsem){+.+.}, at: [] bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: (&bdi->wb_switch_rwsem){+.+.}, at: [] sync_inodes_sb+0x155/0x8b0 fs/fs-writeback.c:2462 2 locks held by kworker/u4:6/9699: #0: ("writeback"){+.+.}, at: [] process_one_work+0x681/0x1620 kernel/workqueue.c:2087 #1: ((&(&wb->dwork)->work)){+.+.}, at: [] process_one_work+0x6b4/0x1620 kernel/workqueue.c:2091 2 locks held by syz-executor.3/9724: #0: (&type->s_umount_key#49){+.+.}, at: [] do_remount fs/namespace.c:2364 [inline] #0: (&type->s_umount_key#49){+.+.}, at: [] do_mount+0x769/0x2af0 fs/namespace.c:2870 #1: (&bdi->wb_switch_rwsem){+.+.}, at: [] bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: (&bdi->wb_switch_rwsem){+.+.}, at: [] sync_inodes_sb+0x155/0x8b0 fs/fs-writeback.c:2462 2 locks held by syz-executor.5/9775: #0: (&type->s_umount_key#49){+.+.}, at: [] do_remount fs/namespace.c:2364 [inline] #0: (&type->s_umount_key#49){+.+.}, at: [] do_mount+0x769/0x2af0 fs/namespace.c:2870 #1: (&bdi->wb_switch_rwsem){+.+.}, at: [] bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: (&bdi->wb_switch_rwsem){+.+.}, at: [] sync_inodes_sb+0x155/0x8b0 fs/fs-writeback.c:2462 2 locks held by kworker/u4:7/9745: #0: ("writeback"){+.+.}, at: [] process_one_work+0x681/0x1620 kernel/workqueue.c:2087 #1: ((&(&wb->dwork)->work)){+.+.}, at: [] process_one_work+0x6b4/0x1620 kernel/workqueue.c:2091 2 locks held by syz-executor.4/9804: #0: (&type->s_umount_key#49){+.+.}, at: [] do_remount fs/namespace.c:2364 [inline] #0: (&type->s_umount_key#49){+.+.}, at: [] do_mount+0x769/0x2af0 fs/namespace.c:2870 #1: (&bdi->wb_switch_rwsem){+.+.}, at: [] bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: (&bdi->wb_switch_rwsem){+.+.}, at: [] sync_inodes_sb+0x155/0x8b0 fs/fs-writeback.c:2462 2 locks held by syz-executor.0/9825: #0: (&type->s_umount_key#49){+.+.}, at: [] do_remount fs/namespace.c:2364 [inline] #0: (&type->s_umount_key#49){+.+.}, at: [] do_mount+0x769/0x2af0 fs/namespace.c:2870 #1: (&bdi->wb_switch_rwsem){+.+.}, at: [] bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: (&bdi->wb_switch_rwsem){+.+.}, at: [] sync_inodes_sb+0x155/0x8b0 fs/fs-writeback.c:2462 2 locks held by syz-executor.1/9842: #0: (&type->s_umount_key#49){+.+.}, at: [] do_remount fs/namespace.c:2364 [inline] #0: (&type->s_umount_key#49){+.+.}, at: [] do_mount+0x769/0x2af0 fs/namespace.c:2870 #1: (&bdi->wb_switch_rwsem){+.+.}, at: [] bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: (&bdi->wb_switch_rwsem){+.+.}, at: [] sync_inodes_sb+0x155/0x8b0 fs/fs-writeback.c:2462 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1530 Comm: khungtaskd Not tainted 4.14.226-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x14b/0x1e7 lib/dump_stack.c:58 nmi_cpu_backtrace.cold.0+0x3c/0x78 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0xf6/0x120 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline] watchdog+0x51b/0xa70 kernel/hung_task.c:274 kthread+0x338/0x400 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4606 Comm: systemd-journal Not tainted 4.14.226-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880a18d83c0 task.stack: ffff8880a18e0000 RIP: 0010:do_syscall_64+0x3b8/0x5b0 arch/x86/entry/common.c:298 RSP: 0018:ffff8880a18e7ef8 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffff8880a18e7f58 RCX: 0000000000000000 RDX: 1ffff1101431b079 RSI: 0000000000000100 RDI: ffff8880a18d83c8 RBP: ffff8880a18e7f48 R08: 000000000000000a R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a18d83c0 R13: ffffffff88f08610 R14: 1ffffffff11e10c0 R15: 0000000000000100 FS: 00007fde146f88c0(0000) GS:ffff8880ba700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fde11b33000 CR3: 00000000a3313000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7fde139b3687 RSP: 002b:00007ffe7bc64b08 EFLAGS: 00000293 ORIG_RAX: 0000000000000053 RAX: fffffffffffffffe RBX: 00007ffe7bc67a20 RCX: 00007fde139b3687 RDX: 00007fde14424a00 RSI: 00000000000001ed RDI: 000055a6e888c8a0 RBP: 00007ffe7bc64b40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000069 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ffe7bc67a20 R15: 00007ffe7bc65030 Code: ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e 8f 00 00 00 41 83 64 24 08 f9 0f 1f 44 00 00 0f 00 2d 28 f7 7f 06 <48> 83 c4 28 5b 41 5c 41 5d 41 5e 41 5f 5d c3 48 89 df e8 a1 e6