INFO: task syz-executor.4:5245 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.4 state:D stack:26960 pid: 5245 ppid: 32537 flags:0x00004006 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 perf_event_free_task+0x519/0x6c0 kernel/events/core.c:12805 copy_process+0x4bd4/0x7580 kernel/fork.c:2460 kernel_clone+0xe7/0xac0 kernel/fork.c:2584 __do_sys_clone+0xc8/0x110 kernel/fork.c:2701 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f9dbac13709 RSP: 002b:00007f9db818a188 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007f9dbad17f60 RCX: 00007f9dbac13709 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000006cbaa500 RBP: 00007f9dbac6dcb4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffede70f51f R14: 00007f9db818a300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8b97fe60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 1 lock held by in:imklog/6232: #0: ffff888073b39770 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 2 locks held by agetty/6267: #0: ffff888024fa2098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:252 #1: ffffc900011682e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcf0/0x1230 drivers/tty/n_tty.c:2113 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 27 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: 9047 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: bat_events batadv_nc_worker RIP: 0010:lock_release+0x429/0x720 kernel/locking/lockdep.c:5649 Code: 00 00 00 00 48 8b 84 24 88 00 00 00 65 48 2b 04 25 28 00 00 00 0f 85 58 02 00 00 48 81 c4 90 00 00 00 5b 5d 41 5c 41 5d 41 5e <41> 5f c3 65 8b 1d 75 32 a6 7e 83 fb 07 0f 87 95 01 00 00 89 db be RSP: 0018:ffffc9000305fc80 EFLAGS: 00000282 RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffc9000305fc18 RDX: 1ffff1100484813d RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffffc9000305fdb0 R13: 0000000000000000 R14: dffffc0000000000 R15: ffff888024240000 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f915e991030 CR3: 000000007c7fe000 CR4: 0000000000350ee0 Call Trace: rcu_lock_release include/linux/rcupdate.h:272 [inline] rcu_read_unlock include/linux/rcupdate.h:720 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:414 [inline] batadv_nc_worker+0x86b/0xfa0 net/batman-adv/network-coding.c:721 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: 00 00 add %al,(%rax) 2: 00 00 add %al,(%rax) 4: 48 8b 84 24 88 00 00 mov 0x88(%rsp),%rax b: 00 c: 65 48 2b 04 25 28 00 sub %gs:0x28,%rax 13: 00 00 15: 0f 85 58 02 00 00 jne 0x273 1b: 48 81 c4 90 00 00 00 add $0x90,%rsp 22: 5b pop %rbx 23: 5d pop %rbp 24: 41 5c pop %r12 26: 41 5d pop %r13 28: 41 5e pop %r14 * 2a: 41 5f pop %r15 <-- trapping instruction 2c: c3 retq 2d: 65 8b 1d 75 32 a6 7e mov %gs:0x7ea63275(%rip),%ebx # 0x7ea632a9 34: 83 fb 07 cmp $0x7,%ebx 37: 0f 87 95 01 00 00 ja 0x1d2 3d: 89 db mov %ebx,%ebx 3f: be .byte 0xbe