INFO: task syz-executor.0:18514 blocked for more than 143 seconds. Not tainted 5.15.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:26968 pid:18514 ppid: 6557 flags:0x00024004 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0x940/0x26f0 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1857 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x176/0x280 kernel/sched/completion.c:138 io_wq_exit_workers fs/io-wq.c:1176 [inline] io_wq_put_and_exit+0x4b2/0xd20 fs/io-wq.c:1211 io_uring_clean_tctx fs/io_uring.c:9675 [inline] io_uring_cancel_generic+0x5fe/0x740 fs/io_uring.c:9755 io_uring_files_cancel include/linux/io_uring.h:16 [inline] do_exit+0x265/0x2a30 kernel/exit.c:780 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x47f/0x2160 kernel/signal.c:2868 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fad4a9de709 RSP: 002b:00007fad47ed1188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: 0000000000000062 RBX: 00007fad4aae3260 RCX: 00007fad4a9de709 RDX: 0000000000000000 RSI: 0000000000006b46 RDI: 0000000000000006 RBP: 00007fad4aa38cb4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd0e9bfe9f R14: 00007fad47ed1300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/26: #0: ffffffff8b97d460 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 no locks held by systemd-journal/2957. ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 26 Comm: khungtaskd Not tainted 5.15.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0xc1d/0xf50 kernel/hung_task.c:295 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 13926 Comm: kworker/u4:11 Not tainted 5.15.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: phy4 ieee80211_iface_work RIP: 0010:task_wait_context kernel/locking/lockdep.c:4628 [inline] RIP: 0010:check_wait_context kernel/locking/lockdep.c:4709 [inline] RIP: 0010:__lock_acquire+0x5c2/0x54a0 kernel/locking/lockdep.c:4965 Code: 38 c8 7f 08 84 c0 0f 85 f3 2b 00 00 0f b6 43 21 44 31 f8 a8 60 74 c1 41 83 c6 01 65 8b 05 2e c1 a7 7e 85 c0 0f 85 cb 0a 00 00 <48> b8 00 00 00 00 00 fc ff df 48 8b 5c 24 40 48 89 da 48 c1 ea 03 RSP: 0018:ffffc9000b50e900 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffff88807df7acb8 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffff8fcffdf9 RBP: ffff88807df7acb1 R08: dffffc0000000000 R09: ffffffff8fcff927 R10: fffffbfff1f9ff24 R11: 0000000000000006 R12: ffff88807df7ad58 R13: ffff88807df7a2c0 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007faf93a6b000 CR3: 0000000079805000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire kernel/locking/lockdep.c:5625 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5590 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162 debug_object_activate+0x12e/0x3e0 lib/debugobjects.c:661 debug_object_activate+0x337/0x3e0 lib/debugobjects.c:707 debug_rcu_head_queue kernel/rcu/rcu.h:176 [inline] kvfree_call_rcu+0x32/0x990 kernel/rcu/tree.c:3543 cfg80211_update_known_bss+0x833/0xa60 net/wireless/scan.c:1660 cfg80211_bss_update+0xef/0x2070 net/wireless/scan.c:1707 cfg80211_inform_single_bss_frame_data+0x6e2/0xee0 net/wireless/scan.c:2411 cfg80211_inform_bss_frame_data+0xa7/0xb10 net/wireless/scan.c:2444 ieee80211_bss_info_update+0x376/0xb60 net/mac80211/scan.c:190 ieee80211_rx_bss_info net/mac80211/ibss.c:1119 [inline] ieee80211_rx_mgmt_probe_beacon+0xcce/0x17c0 net/mac80211/ibss.c:1608 ieee80211_ibss_rx_queued_mgmt+0xd37/0x1610 net/mac80211/ibss.c:1635 ieee80211_iface_process_skb net/mac80211/iface.c:1439 [inline] ieee80211_iface_work+0xa65/0xd00 net/mac80211/iface.c:1493 process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ---------------- Code disassembly (best guess): 0: 38 c8 cmp %cl,%al 2: 7f 08 jg 0xc 4: 84 c0 test %al,%al 6: 0f 85 f3 2b 00 00 jne 0x2bff c: 0f b6 43 21 movzbl 0x21(%rbx),%eax 10: 44 31 f8 xor %r15d,%eax 13: a8 60 test $0x60,%al 15: 74 c1 je 0xffffffd8 17: 41 83 c6 01 add $0x1,%r14d 1b: 65 8b 05 2e c1 a7 7e mov %gs:0x7ea7c12e(%rip),%eax # 0x7ea7c150 22: 85 c0 test %eax,%eax 24: 0f 85 cb 0a 00 00 jne 0xaf5 * 2a: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax <-- trapping instruction 31: fc ff df 34: 48 8b 5c 24 40 mov 0x40(%rsp),%rbx 39: 48 89 da mov %rbx,%rdx 3c: 48 c1 ea 03 shr $0x3,%rdx