syzbot

INFO: task syz-executor:5735 blocked for more than 143 seconds.
      Not tainted syzkaller #0
      Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:23032 pid:5735  tgid:5735  ppid:1      task_flags:0x40054c flags:0x00080003
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5504 [inline]
 __schedule+0x125c/0x6730 kernel/sched/core.c:7228
 __schedule_loop kernel/sched/core.c:7307 [inline]
 schedule+0xdd/0x390 kernel/sched/core.c:7322
 schedule_timeout+0x1b2/0x280 kernel/time/sleep_timeout.c:75
 do_wait_for_common kernel/sched/completion.c:100 [inline]
 __wait_for_common+0x2e7/0x4c0 kernel/sched/completion.c:121
 __flush_work+0x7c7/0xcb0 kernel/workqueue.c:4374
 __cancel_work_sync kernel/workqueue.c:4494 [inline]
 cancel_work_sync+0xd1/0xf0 kernel/workqueue.c:4531
 hci_cmd_sync_clear+0x33/0x100 net/bluetooth/hci_sync.c:655
 hci_unregister_dev+0x1e4/0x690 net/bluetooth/hci_core.c:2674
 vhci_release+0x17d/0x230 drivers/bluetooth/hci_vhci.c:700
 __fput+0x3ff/0xb50 fs/file_table.c:512
 task_work_run+0x150/0x240 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x951/0x2ae0 kernel/exit.c:1004
 do_group_exit+0xd5/0x2a0 kernel/exit.c:1147
 get_signal+0x1ec7/0x21e0 kernel/signal.c:3038
 arch_do_signal_or_restart+0x91/0x7e0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
 exit_to_user_mode_loop+0x139/0x6f0 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x666/0x870 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f10cc35d68e
RSP: 002b:00007ffd4932d6f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: fffffffffffffe00 RBX: 000055556b90a500 RCX: 00007f10cc35d68e
RDX: 0000000000000030 RSI: 00007ffd4932d7f0 RDI: 00000000000000f9
RBP: 00007ffd4932d79c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000258
R13: 00000000000927c0 R14: 000000000000fbd3 R15: 00007ffd4932d7f0
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 nmi_cpu_backtrace.cold+0x12d/0x151 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x1d7/0x230 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
 __sys_info lib/sys_info.c:157 [inline]
 sys_info+0x141/0x190 lib/sys_info.c:165
 check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
 watchdog+0xcb1/0x1030 kernel/hung_task.c:561
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 1114 Comm: kworker/u8:7 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:jhash2 include/linux/jhash.h:129 [inline]
RIP: 0010:hash_stack lib/stackdepot.c:571 [inline]
RIP: 0010:stack_depot_save_flags+0x6e/0x9d0 lib/stackdepot.c:672
Code: 5e 41 5f e9 04 c8 64 06 89 c2 48 8d 04 12 89 c7 44 8d 0c 85 7b 71 f5 75 83 f8 03 0f 86 64 04 00 00 44 89 c8 45 89 c8 4c 89 e6 <8b> 0e 03 46 08 83 ef 03 48 83 c6 0c 44 03 46 f8 29 c1 41 01 c9 89
RSP: 0018:ffffc90004dd6f88 EFLAGS: 00000206
RAX: 0000000075f5720b RBX: 0000000000000001 RCX: 0000000000000001
RDX: 0000000000000012 RSI: ffffc90004dd6fe0 RDI: 0000000000000024
RBP: 0000000000000000 R08: 0000000075f5720b R09: 0000000075f5720b
R10: ffffc90004dd6eb0 R11: 000000000000753b R12: ffffc90004dd6fe0
R13: 0000000000000012 R14: 0000000000a12008 R15: ffffea0000d18c00
FS:  0000000000000000(0000) GS:ffff888124323000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f20b7de8158 CR3: 000000007b9da000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 kasan_save_stack+0x3f/0x50 mm/kasan/common.c:58
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:253 [inline]
 __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2700 [inline]
 slab_free mm/slub.c:6310 [inline]
 kfree+0x22b/0x6c0 mm/slub.c:6625
 ieee80211_inform_bss+0x8f5/0x1170 net/mac80211/scan.c:164
 rdev_inform_bss net/wireless/rdev-ops.h:418 [inline]
 cfg80211_inform_single_bss_data+0x898/0x1dc0 net/wireless/scan.c:2379
 cfg80211_inform_bss_data+0x230/0x39d0 net/wireless/scan.c:3238
 cfg80211_inform_bss_frame_data+0x247/0x760 net/wireless/scan.c:3329
 ieee80211_bss_info_update+0x310/0xab0 net/mac80211/scan.c:230
 ieee80211_rx_bss_info net/mac80211/ibss.c:1064 [inline]
 ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1545 [inline]
 ieee80211_ibss_rx_queued_mgmt+0xe04/0x1c70 net/mac80211/ibss.c:1572
 ieee80211_iface_process_skb net/mac80211/iface.c:1763 [inline]
 ieee80211_iface_work+0xa9a/0x1070 net/mac80211/iface.c:1817
 cfg80211_wiphy_work+0x2b7/0x550 net/wireless/core.c:538
 process_one_work+0xa23/0x1940 kernel/workqueue.c:3322
 process_scheduled_works kernel/workqueue.c:3405 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>