syzbot

INFO: task kworker/u5:1:5088 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u5:1    state:D stack:25768 pid:5088  ppid:2      flags:0x00004000
Workqueue: hci0 hci_error_reset
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0x1553/0x45a0 kernel/sched/core.c:6700
 schedule+0xbd/0x170 kernel/sched/core.c:6774
 schedule_timeout+0xc1/0x2d0 kernel/time/timer.c:2144
 do_wait_for_common kernel/sched/completion.c:95 [inline]
 __wait_for_common kernel/sched/completion.c:116 [inline]
 wait_for_common kernel/sched/completion.c:127 [inline]
 wait_for_completion+0x2cb/0x5b0 kernel/sched/completion.c:148
 __flush_workqueue+0x664/0x13d0 kernel/workqueue.c:3260
 drain_workqueue+0xd3/0x380 kernel/workqueue.c:3373
 destroy_workqueue+0xc4/0xf20 kernel/workqueue.c:4882
 hci_release_dev+0xe2/0x1430 net/bluetooth/hci_core.c:2744
 bt_host_release+0x82/0x90 net/bluetooth/hci_sysfs.c:87
 device_release+0xbc/0x1e0 drivers/base/core.c:-1
 kobject_cleanup lib/kobject.c:689 [inline]
 kobject_release lib/kobject.c:720 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x221/0x460 lib/kobject.c:737
 process_one_work kernel/workqueue.c:2653 [inline]
 process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x3a6/0x3e0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x17a/0x2f0 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
 watchdog+0xf3d/0xf80 kernel/hung_task.c:379
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 23099 Comm: cmp Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:do_strnlen_user lib/strnlen_user.c:-1 [inline]
RIP: 0010:strnlen_user+0x91/0x1c0 lib/strnlen_user.c:113
Code: fd 4c 89 f8 4c 01 f0 0f 88 24 01 00 00 4c 39 f0 0f 82 1b 01 00 00 48 89 1c 24 0f 01 cb 0f ae e8 4c 89 f0 48 83 e0 f8 4c 8b 28 <45> 89 f4 41 83 e4 07 42 8d 0c e5 00 00 00 00 48 c7 c0 ff ff ff ff
RSP: 0018:ffffc900037a79a0 EFLAGS: 00040206
RAX: 00007fffb458cc90 RBX: 0000000000020000 RCX: ffff888053155a00
RDX: 0000000000000000 RSI: 00007fffb458cc95 RDI: 00007fffb45acc95
RBP: ffffc900037a7af0 R08: ffffffff8e8b666f R09: 1ffffffff1d16ccd
R10: dffffc0000000000 R11: fffffbfff1d16cce R12: 00007fffb45acc95
R13: 706d630000000000 R14: 00007fffb458cc95 R15: 0000000000020000
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fffb458b549 CR3: 000000006b608000 CR4: 00000000003506e0
DR0: 0000000000000009 DR1: 00000000000000c9 DR2: 00000000000000f3
DR3: 00000000000000c0 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 create_elf_tables+0xfad/0x1550 fs/binfmt_elf.c:321
 load_elf_binary+0x1d4c/0x2860 fs/binfmt_elf.c:1313
 search_binary_handler fs/exec.c:1775 [inline]
 exec_binprm fs/exec.c:1817 [inline]
 bprm_execve+0xb08/0x1700 fs/exec.c:1892
 do_execveat_common+0x51b/0x6c0 fs/exec.c:1998
 do_execve fs/exec.c:2072 [inline]
 __do_sys_execve fs/exec.c:2148 [inline]
 __se_sys_execve fs/exec.c:2143 [inline]
 __x64_sys_execve+0x92/0xa0 fs/exec.c:2143
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f37535ef107
Code: Unable to access opcode bytes at 0x7f37535ef0dd.
RSP: 002b:00007fffaa109218 EFLAGS: 00000246 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 0000562986c64298 RCX: 00007f37535ef107
RDX: 0000562986c60038 RSI: 0000562986c64298 RDI: 0000562986c600e8
RBP: 0000562986c600e8 R08: 00007fffaa10ed02 R09: 0000000000000210
R10: 0000000000000230 R11: 0000000000000246 R12: 0000562986c60038
R13: 00007f37537b4e8b R14: 0000562986c60038 R15: 0000000000000000
 </TASK>