INFO: task syz-executor.4:11558 blocked for more than 143 seconds. Not tainted 5.17.0-rc1-syzkaller-00186-g23a46422c561 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:27824 pid:11558 ppid: 6775 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:4986 [inline] __schedule+0xab2/0x4db0 kernel/sched/core.c:6295 schedule+0xd2/0x260 kernel/sched/core.c:6368 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6427 __mutex_lock_common kernel/locking/mutex.c:673 [inline] __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:733 tty_release_struct+0xa9/0xe0 drivers/tty/tty_io.c:1704 tty_release+0xc70/0x1200 drivers/tty/tty_io.c:1865 __fput+0x286/0x9f0 fs/file_table.c:311 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:32 [inline] do_exit+0xb29/0x2a30 kernel/exit.c:806 do_group_exit+0xd2/0x2f0 kernel/exit.c:935 get_signal+0x4b0/0x28c0 kernel/signal.c:2862 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868 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: 0033:0x7f998f5cc059 RSP: 002b:00007f998df41168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: 0000000000000000 RBX: 00007f998f6def60 RCX: 00007f998f5cc059 RDX: 0000000020000000 RSI: 0000000000004b67 RDI: 0000000000000005 RBP: 00007f998f62608d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff4c7b3abf R14: 00007f998df41300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8bb83ae0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6460 1 lock held by klogd/2958: #0: ffff8880b9c39c58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2b/0x120 kernel/sched/core.c:489 2 locks held by getty/3278: #0: ffff888023835098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244 #1: ffffc90002b632e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcf0/0x1230 drivers/tty/n_tty.c:2077 1 lock held by syz-executor.4/11558: #0: ffffffff8c5be868 (tty_mutex){+.+.}-{3:3}, at: tty_release_struct+0xa9/0xe0 drivers/tty/tty_io.c:1704 3 locks held by syz-executor.2/11575: 1 lock held by syz-executor.4/11656: #0: ffffffff8c5be868 (tty_mutex){+.+.}-{3:3}, at: tty_open_by_driver drivers/tty/tty_io.c:2050 [inline] #0: ffffffff8c5be868 (tty_mutex){+.+.}-{3:3}, at: tty_open+0x55e/0x1000 drivers/tty/tty_io.c:2133 1 lock held by syz-executor.4/11657: #0: ffffffff8c5be868 (tty_mutex){+.+.}-{3:3}, at: tty_open_by_driver drivers/tty/tty_io.c:2050 [inline] #0: ffffffff8c5be868 (tty_mutex){+.+.}-{3:3}, at: tty_open+0x55e/0x1000 drivers/tty/tty_io.c:2133 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.17.0-rc1-syzkaller-00186-g23a46422c561 #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:111 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline] watchdog+0xc1d/0xf50 kernel/hung_task.c:369 kthread+0x2e9/0x3a0 kernel/kthread.c:377 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: 4436 Comm: kworker/u4:9 Not tainted 5.17.0-rc1-syzkaller-00186-g23a46422c561 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker RIP: 0010:__kasan_check_read+0x0/0x10 mm/kasan/shadow.c:31 Code: 8b e8 af 84 4a 07 48 85 db 0f 85 6c e6 4b 07 48 83 c4 60 5b 5d 41 5c 41 5d c3 c3 e9 6c e7 4b 07 cc cc cc cc cc cc cc cc cc cc <48> 8b 0c 24 89 f6 31 d2 e9 f3 f9 ff ff 0f 1f 00 48 8b 0c 24 89 f6 RSP: 0018:ffffc90004f4fbc8 EFLAGS: 00000256 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff88807bf01d00 RSI: 0000000000000008 RDI: ffffffff8d94c6d0 RBP: 1ffff920009e9f7c R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff88e91491 R11: 0000000000000000 R12: ffffffff8bb83ae0 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000344 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6179a52600 CR3: 000000002219c000 CR4: 0000000000350ef0 Call Trace: instrument_atomic_read include/linux/instrumented.h:71 [inline] test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline] cpumask_test_cpu include/linux/cpumask.h:379 [inline] cpu_online include/linux/cpumask.h:921 [inline] trace_lock_release include/trace/events/lock.h:58 [inline] lock_release+0xa1/0x720 kernel/locking/lockdep.c:5650 rcu_lock_release include/linux/rcupdate.h:273 [inline] rcu_read_unlock include/linux/rcupdate.h:727 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:412 [inline] batadv_nc_worker+0x86b/0xfa0 net/batman-adv/network-coding.c:719 process_one_work+0x9ac/0x1650 kernel/workqueue.c:2307 worker_thread+0x657/0x1110 kernel/workqueue.c:2454 kthread+0x2e9/0x3a0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ---------------- Code disassembly (best guess): 0: 8b e8 mov %eax,%ebp 2: af scas %es:(%rdi),%eax 3: 84 4a 07 test %cl,0x7(%rdx) 6: 48 85 db test %rbx,%rbx 9: 0f 85 6c e6 4b 07 jne 0x74be67b f: 48 83 c4 60 add $0x60,%rsp 13: 5b pop %rbx 14: 5d pop %rbp 15: 41 5c pop %r12 17: 41 5d pop %r13 19: c3 retq 1a: c3 retq 1b: e9 6c e7 4b 07 jmpq 0x74be78c 20: cc int3 21: cc int3 22: cc int3 23: cc int3 24: cc int3 25: cc int3 26: cc int3 27: cc int3 28: cc int3 29: cc int3 * 2a: 48 8b 0c 24 mov (%rsp),%rcx <-- trapping instruction 2e: 89 f6 mov %esi,%esi 30: 31 d2 xor %edx,%edx 32: e9 f3 f9 ff ff jmpq 0xfffffa2a 37: 0f 1f 00 nopl (%rax) 3a: 48 8b 0c 24 mov (%rsp),%rcx 3e: 89 f6 mov %esi,%esi