INFO: task segctord:10428 blocked for more than 143 seconds. Not tainted 6.2.0-rc7-syzkaller-00011-g05ecb680708a #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:segctord state:D stack:28440 pid:10428 ppid:2 flags:0x00004000 Call Trace: __schedule+0x13ca/0x43c0 schedule+0xc3/0x190 rwsem_down_write_slowpath+0xfb5/0x1490 nilfs_transaction_lock+0x25c/0x4f0 nilfs_segctor_thread+0x51b/0x1150 kthread+0x270/0x300 ret_from_fork+0x1f/0x30 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/12: #0: ffffffff8cf26e10 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x26/0xce0 1 lock held by rcu_tasks_trace/13: #0: ffffffff8cf27610 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x26/0xce0 1 lock held by khungtaskd/28: #0: ffffffff8cf26c40 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 1 lock held by udevd/4435: 2 locks held by getty/4757: #0: ffff88802c193098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 #1: ffffc900015802f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x53b/0x1630 1 lock held by syz-executor.0/5105: #0: ffffffff8cf2c278 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x389/0x860 2 locks held by kworker/1:5/5162: #0: ffff8880b993b1d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 #1: ffff8880b9928748 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x635/0x9d0 2 locks held by kworker/0:11/5731: #0: ffff888012472538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x7eb/0x13e0 #1: ffffc90014167d20 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work+0x835/0x13e0 1 lock held by syz-executor.3/7380: #0: ffffffff8cf2c278 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x458/0x860 4 locks held by syz-executor.1/10421: 1 lock held by segctord/10428: #0: ffff888022b762a0 (&nilfs->ns_segctor_sem){++++}-{3:3}, at: nilfs_transaction_lock+0x25c/0x4f0 6 locks held by syz-executor.2/14184: 1 lock held by syz-executor.2/14198: #0: ffff88803dc0ef90 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: path_openat+0x7a6/0x2e30 1 lock held by syz-executor.2/16442: 2 locks held by syz-executor.1/16441: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.2.0-rc7-syzkaller-00011-g05ecb680708a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 Call Trace: dump_stack_lvl+0x1b5/0x2a0 nmi_cpu_backtrace+0x47b/0x500 nmi_trigger_cpumask_backtrace+0x1d3/0x430 watchdog+0xf70/0xfb0 kthread+0x270/0x300 ret_from_fork+0x1f/0x30 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 14270 Comm: udevd Not tainted 6.2.0-rc7-syzkaller-00011-g05ecb680708a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 RIP: 0010:unwind_next_frame+0x1e9/0x22b0 Code: 0f 86 3b 1a 00 00 89 e8 48 8d 1c 85 98 75 6a 8f 48 89 d8 48 c1 e8 03 42 0f b6 04 20 84 c0 4d 89 e6 0f 85 96 1b 00 00 44 8b 23 <89> e8 ff c0 48 8d 1c 85 98 75 6a 8f 48 89 d8 48 c1 e8 03 42 0f b6 RSP: 0018:ffffc90006f5f320 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffffffff8f89a3d0 RCX: 000000000009e001 RDX: dffffc0000000000 RSI: ffffffff88cb8eeb RDI: ffffffff813c73a7 RBP: 000000000007cb8e R08: 0000000000000006 R09: ffffc90006f5f4d0 R10: 0000000000000000 R11: dffffc0000000001 R12: 000000000014ef60 R13: ffffffff88cb8eea R14: dffffc0000000000 R15: 000000000009e001 FS: 00007f89b9ef0840(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbbea029000 CR3: 0000000040b3d000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: arch_stack_walk+0xab/0xe0 stack_trace_save+0x10a/0x1e0 kasan_set_track+0x40/0x70 kasan_save_free_info+0x2b/0x40 ____kasan_slab_free+0xd6/0x120 __kmem_cache_free+0x264/0x3c0 skb_release_data+0x618/0x7e0 consume_skb+0xac/0x150 netlink_unicast+0x7cb/0x990 netlink_sendmsg+0xa02/0xd10 ____sys_sendmsg+0x5c9/0x9c0 __sys_sendmsg+0x275/0x360 do_syscall_64+0x41/0xc0 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f89b9b35163 Code: 64 89 02 48 c7 c0 ff ff ff ff eb b7 66 2e 0f 1f 84 00 00 00 00 00 90 64 8b 04 25 18 00 00 00 85 c0 75 14 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 55 c3 0f 1f 40 00 48 83 ec 28 89 54 24 1c 48 RSP: 002b:00007ffd461ec138 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000560866423f40 RCX: 00007f89b9b35163 RDX: 0000000000000000 RSI: 00007ffd461ec148 RDI: 000000000000000c RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000010000 R11: 0000000000000246 R12: 0000000000000000 R13: 00000000000000b9 R14: 0000000000000000 R15: 00005608663e0910