INFO: task syz-executor.2:3623 can't die for more than 143 seconds. task:syz-executor.2 state:D stack:26272 pid: 3623 ppid: 32020 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4955 [inline] __schedule+0x940/0x26f0 kernel/sched/core.c:6236 schedule+0xd3/0x270 kernel/sched/core.c:6315 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 __flush_work+0x56e/0xb10 kernel/workqueue.c:3083 __cancel_work_timer+0x3f9/0x570 kernel/workqueue.c:3170 p9_conn_destroy net/9p/trans_fd.c:886 [inline] p9_fd_close+0x29c/0x520 net/9p/trans_fd.c:921 p9_client_create+0x95a/0x1110 net/9p/client.c:1073 v9fs_session_init+0x1dd/0x17b0 fs/9p/v9fs.c:407 v9fs_mount+0x79/0x9c0 fs/9p/vfs_super.c:126 legacy_get_tree+0x105/0x220 fs/fs_context.c:610 vfs_get_tree+0x89/0x2f0 fs/super.c:1498 do_new_mount fs/namespace.c:2988 [inline] path_mount+0x1320/0x1fa0 fs/namespace.c:3318 do_mount fs/namespace.c:3331 [inline] __do_sys_mount fs/namespace.c:3539 [inline] __se_sys_mount fs/namespace.c:3516 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3516 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: 0033:0x7f657a4e48d9 RSP: 002b:00007f6577a3a188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f657a5e9020 RCX: 00007f657a4e48d9 RDX: 00000000200001c0 RSI: 0000000020000180 RDI: 0000000000000000 RBP: 00007f657a53ecb4 R08: 00000000200002c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffda7d880af R14: 00007f6577a3a300 R15: 0000000000022000 INFO: task syz-executor.2:3623 blocked for more than 143 seconds. Not tainted 5.15.0-rc4-next-20211006-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:26272 pid: 3623 ppid: 32020 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4955 [inline] __schedule+0x940/0x26f0 kernel/sched/core.c:6236 schedule+0xd3/0x270 kernel/sched/core.c:6315 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 __flush_work+0x56e/0xb10 kernel/workqueue.c:3083 __cancel_work_timer+0x3f9/0x570 kernel/workqueue.c:3170 p9_conn_destroy net/9p/trans_fd.c:886 [inline] p9_fd_close+0x29c/0x520 net/9p/trans_fd.c:921 p9_client_create+0x95a/0x1110 net/9p/client.c:1073 v9fs_session_init+0x1dd/0x17b0 fs/9p/v9fs.c:407 v9fs_mount+0x79/0x9c0 fs/9p/vfs_super.c:126 legacy_get_tree+0x105/0x220 fs/fs_context.c:610 vfs_get_tree+0x89/0x2f0 fs/super.c:1498 do_new_mount fs/namespace.c:2988 [inline] path_mount+0x1320/0x1fa0 fs/namespace.c:3318 do_mount fs/namespace.c:3331 [inline] __do_sys_mount fs/namespace.c:3539 [inline] __se_sys_mount fs/namespace.c:3516 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3516 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: 0033:0x7f657a4e48d9 RSP: 002b:00007f6577a3a188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f657a5e9020 RCX: 00007f657a4e48d9 RDX: 00000000200001c0 RSI: 0000000020000180 RDI: 0000000000000000 RBP: 00007f657a53ecb4 R08: 00000000200002c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffda7d880af R14: 00007f6577a3a300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8b981260 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458 1 lock held by systemd-journal/2967: 1 lock held by in:imklog/6233: #0: ffff888072b6a370 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 2 locks held by rs:main Q:Reg/6234: #0: ffff88801d414d70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 #1: ffff88807f070460 (sb_writers#5){.+.+}-{0:0}, at: ksys_write+0x12d/0x250 fs/read_write.c:647 2 locks held by kworker/u4:10/3519: #0: ffffffff8b981260 (rcu_read_lock){....}-{1:2}, at: raw_spin_rq_lock_nested+0x1e/0x30 kernel/sched/core.c:474 #1: ffff8880b9c279c8 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x173/0x490 kernel/sched/psi.c:871 2 locks held by agetty/7474: #0: ffff88801c543098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:252 #1: ffffc900042e52e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcf0/0x1230 drivers/tty/n_tty.c:2113 2 locks held by kworker/0:0/28650: #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline] #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:634 [inline] #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:661 [inline] #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x896/0x1690 kernel/workqueue.c:2268 #1: ffffc90003847db0 ((work_completion)(&m->rq)){+.+.}-{0:0}, at: process_one_work+0x8ca/0x1690 kernel/workqueue.c:2272 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.0-rc4-next-20211006-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:254 [inline] watchdog+0xcb7/0xed0 kernel/hung_task.c:339 kthread+0x405/0x4f0 kernel/kthread.c:327 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: 10899 Comm: kworker/u4:5 Not tainted 5.15.0-rc4-next-20211006-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: 0x0 (bond1) RIP: 0010:lock_release+0xc/0x720 kernel/locking/lockdep.c:5645 Code: e9 55 fe ff ff 48 c7 c7 a8 2b 6f 8d e8 fd 25 61 00 e9 6d fd ff ff 0f 1f 84 00 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 41 57 <41> 56 41 55 41 54 49 89 fc 55 53 48 81 ec 90 00 00 00 48 8d 6c 24 RSP: 0018:ffffc90011a27c60 EFLAGS: 00000093 RAX: dffffc0000000000 RBX: ffff88801af77500 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff81522278 RDI: ffffffff8b981260 RBP: ffff8880888cba00 R08: 0000000000000001 R09: ffffffff8fd1e947 R10: fffffbfff1fa3d28 R11: 0000000000000001 R12: 00000000014b1c1b R13: 0000000000000002 R14: ffff88801af77630 R15: ffff88813fe38000 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc5c0018208 CR3: 000000000b68e000 CR4: 00000000003526f0 Call Trace: account_system_index_time+0xec/0x120 kernel/sched/cputime.c:173 vtime_account_system+0x63/0xb0 kernel/sched/cputime.c:668 __vtime_account_kernel kernel/sched/cputime.c:690 [inline] vtime_task_switch_generic+0xfa/0x5a0 kernel/sched/cputime.c:772 vtime_task_switch include/linux/vtime.h:95 [inline] finish_task_switch.isra.0+0x4b5/0xa20 kernel/sched/core.c:4811 context_switch kernel/sched/core.c:4958 [inline] __schedule+0x948/0x26f0 kernel/sched/core.c:6236 schedule+0xd3/0x270 kernel/sched/core.c:6315 worker_thread+0x15c/0x11f0 kernel/workqueue.c:2465 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ---------------- Code disassembly (best guess): 0: e9 55 fe ff ff jmpq 0xfffffe5a 5: 48 c7 c7 a8 2b 6f 8d mov $0xffffffff8d6f2ba8,%rdi c: e8 fd 25 61 00 callq 0x61260e 11: e9 6d fd ff ff jmpq 0xfffffd83 16: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1) 1d: 00 1e: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 25: fc ff df 28: 41 57 push %r15 * 2a: 41 56 push %r14 <-- trapping instruction 2c: 41 55 push %r13 2e: 41 54 push %r12 30: 49 89 fc mov %rdi,%r12 33: 55 push %rbp 34: 53 push %rbx 35: 48 81 ec 90 00 00 00 sub $0x90,%rsp 3c: 48 rex.W 3d: 8d .byte 0x8d 3e: 6c insb (%dx),%es:(%rdi) 3f: 24 .byte 0x24