INFO: task syz-executor.0:26858 blocked for more than 143 seconds. Not tainted 5.15.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:26160 pid:26858 ppid: 20549 flags:0x00024004 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0xb44/0x5960 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:1174 [inline] io_wq_put_and_exit+0x4b2/0xd20 fs/io-wq.c:1209 io_uring_clean_tctx fs/io_uring.c:9718 [inline] io_uring_cancel_generic+0x616/0x760 fs/io_uring.c:9798 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:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f6c1f714a39 RSP: 002b:00007f6c1cc8a188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: 00000000000000aa RBX: 00007f6c1f817f60 RCX: 00007f6c1f714a39 RDX: 0000000000000000 RSI: 00000000000000b2 RDI: 0000000000000004 RBP: 00007f6c1f76ec5f R08: 0000000000000000 R09: 0000000000007401 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffba77587f R14: 00007f6c1cc8a300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8b97f120 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 5 locks held by kworker/u4:4/1077: #0: ffff8880b9c31ad8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2b/0x120 kernel/sched/core.c:474 #1: ffffc90004f9fdb0 ((work_completion)(&(&bat_priv->nc.work)->work)){+.+.}-{0:0}, at: process_one_work+0x8d7/0x16b0 kernel/workqueue.c:2272 #2: ffff8880b9d20258 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x60c/0xe30 kernel/time/timer.c:1043 #3: ffffffff90490720 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_activate+0x12e/0x3e0 lib/debugobjects.c:661 #4: ffffffff8cda4e18 (dsp_lock){..-.}-{2:2}, at: dsp_cmx_send+0x1f/0x1580 drivers/isdn/mISDN/dsp_cmx.c:1643 2 locks held by agetty/6483: #0: ffff88801fe31098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:252 #1: ffffc900012602e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcf0/0x1230 drivers/tty/n_tty.c:2113 3 locks held by kworker/1:7/26570: #0: ffff8880b9d31ad8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2b/0x120 kernel/sched/core.c:474 #1: ffff8880b9d1f9c8 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x39d/0x480 kernel/sched/psi.c:880 #2: ffff8880b9d20030 (krc.lock){..-.}-{2:2}, at: kfree_rcu_monitor+0x2f/0x830 kernel/rcu/tree.c:3334 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.0-rc6-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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 1077 Comm: kworker/u4:4 Not tainted 5.15.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: phy35 ieee80211_iface_work RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0xd/0x60 kernel/kcov.c:197 Code: ff ff ba 08 00 00 00 4d 8b 03 48 0f bd ca 49 8b 45 00 48 63 c9 e9 64 ff ff ff 0f 1f 00 65 8b 05 69 e1 8b 7e 89 c1 48 8b 34 24 <81> e1 00 01 00 00 65 48 8b 14 25 40 f0 01 00 a9 00 01 ff 00 74 0e RSP: 0018:ffffc90004f9eec8 EFLAGS: 00000206 RAX: 0000000080000000 RBX: 0000000000000028 RCX: 0000000080000000 RDX: 0000000000000000 RSI: ffffffff8892d42a RDI: 0000000000000003 RBP: ffffc90004f9f240 R08: 0000000000000001 R09: ffffc90004f9ef70 R10: ffffffff8892d41b R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8880137d9874 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2e48e8d000 CR3: 000000007cf91000 CR4: 00000000003506f0 Call Trace: _ieee802_11_parse_elems_crc+0xda/0x20f0 net/mac80211/util.c:1007 ieee802_11_parse_elems_crc+0x89e/0xfe0 net/mac80211/util.c:1490 ieee802_11_parse_elems net/mac80211/ieee80211_i.h:2207 [inline] ieee80211_bss_info_update+0x468/0xb60 net/mac80211/scan.c:212 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), 2 bytes skipped: 0: ba 08 00 00 00 mov $0x8,%edx 5: 4d 8b 03 mov (%r11),%r8 8: 48 0f bd ca bsr %rdx,%rcx c: 49 8b 45 00 mov 0x0(%r13),%rax 10: 48 63 c9 movslq %ecx,%rcx 13: e9 64 ff ff ff jmpq 0xffffff7c 18: 0f 1f 00 nopl (%rax) 1b: 65 8b 05 69 e1 8b 7e mov %gs:0x7e8be169(%rip),%eax # 0x7e8be18b 22: 89 c1 mov %eax,%ecx 24: 48 8b 34 24 mov (%rsp),%rsi * 28: 81 e1 00 01 00 00 and $0x100,%ecx <-- trapping instruction 2e: 65 48 8b 14 25 40 f0 mov %gs:0x1f040,%rdx 35: 01 00 37: a9 00 01 ff 00 test $0xff0100,%eax 3c: 74 0e je 0x4c