INFO: task syz-executor.4:16594 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D26136 16594 8162 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 xlog_grant_head_wait+0x13b/0xcd0 fs/xfs/xfs_log.c:263 xlog_grant_head_check+0x3c8/0x420 fs/xfs/xfs_log.c:325 xfs_log_reserve+0x347/0xa70 fs/xfs/xfs_log.c:454 xfs_trans_reserve+0x63a/0x9c0 fs/xfs/xfs_trans.c:197 IPVS: ftp: loaded support on port[0] = 21 xfs_trans_alloc+0x2f7/0x700 fs/xfs/xfs_trans.c:289 xlog_finish_defer_ops fs/xfs/xfs_log_recover.c:4841 [inline] xlog_recover_process_intents+0x274/0x430 fs/xfs/xfs_log_recover.c:4947 xlog_recover_finish+0x5f/0x230 fs/xfs/xfs_log_recover.c:5839 xfs_log_mount_finish+0x135/0x450 fs/xfs/xfs_log.c:778 xfs_mountfs+0x1032/0x1bf0 fs/xfs/xfs_mount.c:974 xfs_fs_fill_super+0xd0e/0x1540 fs/xfs/xfs_super.c:1720 mount_bdev+0x2fc/0x3b0 fs/super.c:1158 mount_fs+0xa3/0x310 fs/super.c:1261 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2492 [inline] do_mount+0x115c/0x2f50 fs/namespace.c:2822 ksys_mount+0xcf/0x130 fs/namespace.c:3038 __do_sys_mount fs/namespace.c:3052 [inline] __se_sys_mount fs/namespace.c:3049 [inline] __x64_sys_mount+0xba/0x150 fs/namespace.c:3049 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fb43c84e62a Code: Bad RIP value. RSP: 002b:00007fb43adbef88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000000baed RCX: 00007fb43c84e62a RDX: 000000002000bb00 RSI: 0000000020000040 RDI: 00007fb43adbefe0 RBP: 00007fb43adbf020 R08: 00007fb43adbf020 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 000000002000bb00 R13: 0000000020000040 R14: 00007fb43adbefe0 R15: 0000000020000080 Showing all locks held in the system: 3 locks held by kworker/u4:0/7: #0: 0000000019d7ee93 (&rq->lock){-.-.}, at: idle_balance kernel/sched/fair.c:9702 [inline] #0: 0000000019d7ee93 (&rq->lock){-.-.}, at: pick_next_task_fair+0x556/0x1570 kernel/sched/fair.c:6841 #1: 0000000019d7ee93 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1826 [inline] #1: 0000000019d7ee93 (&rq->lock){-.-.}, at: attach_tasks kernel/sched/fair.c:7432 [inline] #1: 0000000019d7ee93 (&rq->lock){-.-.}, at: load_balance+0xa88/0x2080 kernel/sched/fair.c:8749 #2: 00000000d10e70f3 (rcu_read_lock){....}, at: trace_sched_stat_runtime include/trace/events/sched.h:428 [inline] #2: 00000000d10e70f3 (rcu_read_lock){....}, at: update_curr+0x2c3/0x870 kernel/sched/fair.c:857 4 locks held by kworker/u4:4/388: #0: 0000000027002b1c ((wq_completion)"%s""netns"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 0000000010032b59 (net_cleanup_work){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 #2: 000000001f688d76 (pernet_ops_rwsem){++++}, at: cleanup_net+0xa8/0x8b0 net/core/net_namespace.c:521 #3: 00000000624fbe27 (rcu_preempt_state.barrier_mutex){+.+.}, at: _rcu_barrier+0x59/0x3e0 kernel/rcu/tree.c:3430 1 lock held by khungtaskd/1571: #0: 00000000d10e70f3 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by in:imklog/7798: #0: 00000000c7ec0c4a (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 2 locks held by agetty/8030: #0: 0000000075755533 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 0000000060088057 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1950 drivers/tty/n_tty.c:2154 2 locks held by syz-executor.4/16594: #0: 000000002f7f72cf (&type->s_umount_key#49/1){+.+.}, at: alloc_super fs/super.c:226 [inline] #0: 000000002f7f72cf (&type->s_umount_key#49/1){+.+.}, at: sget_userns+0x20b/0xcd0 fs/super.c:519 #1: 0000000035a369d3 (sb_internal#2){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] #1: 0000000035a369d3 (sb_internal#2){.+.+}, at: xfs_trans_alloc+0x4fc/0x700 fs/xfs/xfs_trans.c:271 1 lock held by syz-executor.4/18610: #0: 000000002f7f72cf (&type->s_umount_key#55){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 1 lock held by syz-executor.4/19974: #0: 0000000002d1bff8 (rcu_preempt_state.exp_mutex){+.+.}, at: exp_funnel_lock kernel/rcu/tree_exp.h:297 [inline] #0: 0000000002d1bff8 (rcu_preempt_state.exp_mutex){+.+.}, at: _synchronize_rcu_expedited+0x4dc/0x6f0 kernel/rcu/tree_exp.h:667 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1571 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4683 Comm: systemd-journal Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023 RIP: 0010:__lock_acquire+0x193/0x3ff0 kernel/locking/lockdep.c:3275 Code: ff 83 fe 01 0f 86 98 00 00 00 31 d2 4c 89 f7 e8 c3 92 ff ff 48 85 c0 0f 85 b5 00 00 00 45 31 ff 48 b8 00 00 00 00 00 fc ff df <48> 03 44 24 08 48 c7 00 00 00 00 00 48 c7 40 08 00 00 00 00 c7 40 RSP: 0018:ffff8880ba1079e8 EFLAGS: 00000083 RAX: dffffc0000000000 RBX: 578dfcc3321df113 RCX: acf46678372ca14e RDX: 1ffff110142a8978 RSI: 0000000072cbad1e RDI: 0000000000000000 RBP: 0000000000000000 R08: 00000000c948a498 R09: 0000000000000003 R10: ffff8880a1544c40 R11: ffffffff8c66505b R12: acf46678372ca14e R13: ffff8880a1544340 R14: ffff8880a1544c58 R15: 0000000000000001 FS: 00007f5bdf9038c0(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5bdce05028 CR3: 00000000a1494000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908 rcu_lock_acquire include/linux/rcupdate.h:242 [inline] rcu_read_lock include/linux/rcupdate.h:627 [inline] __lock_task_sighand+0x43/0x300 kernel/signal.c:1345 lock_task_sighand include/linux/sched/signal.h:669 [inline] send_sigqueue+0x151/0x9f0 kernel/signal.c:1778 posix_timer_event+0xdd/0x130 kernel/time/posix-timers.c:349 alarm_handle_timer+0xda/0x2a0 kernel/time/alarmtimer.c:554 alarmtimer_fired+0x122/0x5e0 kernel/time/alarmtimer.c:215 __run_hrtimer kernel/time/hrtimer.c:1465 [inline] __hrtimer_run_queues+0x3f6/0xe60 kernel/time/hrtimer.c:1527 hrtimer_interrupt+0x326/0x9e0 kernel/time/hrtimer.c:1585 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1071 [inline] smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1096 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] RIP: 0010:read_seqcount_begin include/linux/seqlock.h:164 [inline] RIP: 0010:__follow_mount_rcu+0x406/0x6f0 fs/namei.c:1340 Code: 82 f1 89 48 c1 e8 03 80 3c 18 00 0f 85 9f 02 00 00 48 83 3d b3 5e 4c 08 00 0f 84 ce 00 00 00 e8 90 61 bd ff 48 8b 3c 24 57 9d <0f> 1f 44 00 00 e9 eb fe ff ff 41 bc 01 00 00 00 e9 ea fc ff ff e8 RSP: 0018:ffff8880a154f890 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff8880a1544340 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff81a523e0 RDI: 0000000000000293 RBP: ffff8880a154fa68 R08: ffffffff8cd2a520 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880ae2e46e0 R13: ffffed10142a9f4e R14: ffff8880a154fcf8 R15: 0000000000000200 lookup_fast+0x36f/0x1080 fs/namei.c:1609 walk_component+0xde/0xda0 fs/namei.c:1807 link_path_walk.part.0+0x901/0x1230 fs/namei.c:2142 link_path_walk fs/namei.c:2270 [inline] path_lookupat+0xe4/0x8d0 fs/namei.c:2318 filename_lookup+0x1ac/0x5a0 fs/namei.c:2349 user_path_at include/linux/namei.h:57 [inline] do_faccessat+0x248/0x7a0 fs/open.c:397 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f5bdebbe9c7 Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007ffcc881c1b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00007ffcc881f0d0 RCX: 00007f5bdebbe9c7 RDX: 00007f5bdf62fa00 RSI: 0000000000000000 RDI: 00005604184c29a3 RBP: 00007ffcc881c1f0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ffcc881f0d0 R15: 00007ffcc881c6e0