INFO: task syz-executor.2:12421 can't die for more than 143 seconds. task:syz-executor.2 state:D stack:27072 pid:12421 ppid: 8547 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x8eb/0x21b0 kernel/sched/core.c:5078 schedule+0xcf/0x270 kernel/sched/core.c:5157 d_wait_lookup fs/dcache.c:2527 [inline] d_alloc_parallel+0x1272/0x1ae0 fs/dcache.c:2609 __lookup_slow+0x193/0x480 fs/namei.c:1529 lookup_slow fs/namei.c:1561 [inline] walk_component+0x418/0x6a0 fs/namei.c:1861 lookup_last fs/namei.c:2310 [inline] path_lookupat+0x1ba/0x830 fs/namei.c:2334 filename_lookup+0x19f/0x560 fs/namei.c:2367 unix_find_other+0xd1/0x6f0 net/unix/af_unix.c:935 unix_dgram_sendmsg+0xc73/0x1a80 net/unix/af_unix.c:1695 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x331/0x810 net/socket.c:2345 ___sys_sendmsg+0xf3/0x170 net/socket.c:2399 __sys_sendmmsg+0x195/0x470 net/socket.c:2489 __do_sys_sendmmsg net/socket.c:2518 [inline] __se_sys_sendmmsg net/socket.c:2515 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2515 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e159 RSP: 002b:00007f60b0222c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045e159 RDX: 0000000000000002 RSI: 0000000020008600 RDI: 0000000000000005 RBP: 000000000119bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffd9495b6df R14: 00007f60b02239c0 R15: 000000000119bf8c INFO: task syz-executor.2:12421 blocked for more than 144 seconds. Not tainted 5.10.0-next-20201215-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:27072 pid:12421 ppid: 8547 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x8eb/0x21b0 kernel/sched/core.c:5078 schedule+0xcf/0x270 kernel/sched/core.c:5157 d_wait_lookup fs/dcache.c:2527 [inline] d_alloc_parallel+0x1272/0x1ae0 fs/dcache.c:2609 __lookup_slow+0x193/0x480 fs/namei.c:1529 lookup_slow fs/namei.c:1561 [inline] walk_component+0x418/0x6a0 fs/namei.c:1861 lookup_last fs/namei.c:2310 [inline] path_lookupat+0x1ba/0x830 fs/namei.c:2334 filename_lookup+0x19f/0x560 fs/namei.c:2367 unix_find_other+0xd1/0x6f0 net/unix/af_unix.c:935 unix_dgram_sendmsg+0xc73/0x1a80 net/unix/af_unix.c:1695 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x331/0x810 net/socket.c:2345 ___sys_sendmsg+0xf3/0x170 net/socket.c:2399 __sys_sendmmsg+0x195/0x470 net/socket.c:2489 __do_sys_sendmmsg net/socket.c:2518 [inline] __se_sys_sendmmsg net/socket.c:2515 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2515 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e159 RSP: 002b:00007f60b0222c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045e159 RDX: 0000000000000002 RSI: 0000000020008600 RDI: 0000000000000005 RBP: 000000000119bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffd9495b6df R14: 00007f60b02239c0 R15: 000000000119bf8c INFO: task syz-executor.2:12428 can't die for more than 144 seconds. task:syz-executor.2 state:R running task stack:27520 pid:12428 ppid: 8547 flags:0x00004006 Call Trace: Showing all locks held in the system: 2 locks held by kworker/u4:3/132: #0: ffff8880b9c34c58 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1318 [inline] #0: ffff8880b9c34c58 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x235/0x21b0 kernel/sched/core.c:4995 #1: ffff8880b9c20088 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x305/0x440 kernel/sched/psi.c:833 1 lock held by khungtaskd/1658: #0: ffffffff8b78f920 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x28c kernel/locking/lockdep.c:6254 1 lock held by in:imklog/8271: #0: ffff888018d1d9f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:923 1 lock held by syz-executor.2/12421: #0: ffff88807d4b8150 (&type->i_mutex_dir_key#9){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:783 [inline] #0: ffff88807d4b8150 (&type->i_mutex_dir_key#9){.+.+}-{3:3}, at: lookup_slow fs/namei.c:1560 [inline] #0: ffff88807d4b8150 (&type->i_mutex_dir_key#9){.+.+}-{3:3}, at: walk_component+0x409/0x6a0 fs/namei.c:1861 2 locks held by syz-executor.2/12428: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1658 Comm: khungtaskd Not tainted 5.10.0-next-20201215-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x3c/0xef lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:147 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:253 [inline] watchdog+0xe75/0x1020 kernel/hung_task.c:338 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 10698 Comm: kworker/0:13 Not tainted 5.10.0-next-20201215-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events toggle_allocation_gate RIP: 0010:test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline] RIP: 0010:hlock_class kernel/locking/lockdep.c:198 [inline] RIP: 0010:mark_lock+0xea/0x1720 kernel/locking/lockdep.c:4389 Code: b6 04 02 84 c0 74 08 3c 03 0f 8e 8f 07 00 00 44 0f b7 75 20 66 41 81 e6 ff 1f 45 0f b7 f6 be 08 00 00 00 4c 89 f0 48 c1 f8 06 <48> 8d 3c c5 a0 37 51 8f e8 59 36 5e 00 4c 0f a3 35 11 9f f9 0d 0f RSP: 0018:ffffc9000936f630 EFLAGS: 00000002 RAX: 0000000000000002 RBX: 1ffff9200126decc RCX: 0000000000000006 RDX: 1ffff110036274af RSI: 0000000000000008 RDI: ffff88801b139b00 RBP: ffff88801b13a558 R08: 0000000000000000 R09: ffffffff8f5137b7 R10: fffffbfff1ea26f6 R11: 0000000000000001 R12: 0000000000000006 R13: 0000000000000040 R14: 000000000000008f R15: ffff88801b13a490 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff31cca9000 CR3: 000000000b48e000 CR4: 00000000001526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: mark_usage kernel/locking/lockdep.c:4324 [inline] __lock_acquire+0x8a7/0x54b0 kernel/locking/lockdep.c:4786 lock_acquire kernel/locking/lockdep.c:5437 [inline] lock_acquire+0x29d/0x750 kernel/locking/lockdep.c:5402 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:354 [inline] __get_locked_pte+0x2d1/0x4f0 mm/memory.c:1623 get_locked_pte include/linux/mm.h:2000 [inline] __text_poke+0x1ac/0x960 arch/x86/kernel/alternative.c:896 text_poke_bp_batch+0x187/0x550 arch/x86/kernel/alternative.c:1190 text_poke_flush arch/x86/kernel/alternative.c:1347 [inline] text_poke_flush arch/x86/kernel/alternative.c:1344 [inline] text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1354 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:126 jump_label_update kernel/jump_label.c:814 [inline] jump_label_update+0x1b3/0x3a0 kernel/jump_label.c:793 static_key_enable_cpuslocked+0x1cf/0x280 kernel/jump_label.c:177 static_key_enable+0x16/0x20 kernel/jump_label.c:190 toggle_allocation_gate mm/kfence/core.c:594 [inline] toggle_allocation_gate+0x116/0x260 mm/kfence/core.c:587 process_one_work+0x98d/0x1630 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296