device syzkaller1 entered promiscuous mode netlink: 28 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 16 bytes leftover after parsing attributes in process `syz-executor.3'. INFO: task syz-executor.3:20577 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 EXT4-fs error (device loop4): ext4_mb_generate_buddy:744: group 0, block bitmap and bg descriptor inconsistent: 25 vs 150994969 free clusters "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. EXT4-fs (loop4): Delayed block allocation failed for inode 18 at logical offset 0 with max blocks 1 with error 28 syz-executor.3 D28416 20577 8122 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 EXT4-fs (loop4): This should not happen!! Data will be lost EXT4-fs (loop4): Total free blocks count 0 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 schedule_timeout+0x92d/0xfe0 kernel/time/timer.c:1794 EXT4-fs (loop4): Free/Dirty block details EXT4-fs (loop4): free_blocks=2415919104 EXT4-fs (loop4): dirty_blocks=16 EXT4-fs (loop4): Block reservation details EXT4-fs (loop4): i_reserved_data_blocks=1 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common+0x29c/0x470 kernel/sched/completion.c:115 __flush_work+0x4bb/0x8b0 kernel/workqueue.c:2926 __cancel_work_timer+0x412/0x590 kernel/workqueue.c:3013 p9_conn_destroy net/9p/trans_fd.c:904 [inline] p9_fd_close+0x305/0x520 net/9p/trans_fd.c:934 p9_client_destroy+0xbe/0x360 net/9p/client.c:1101 v9fs_session_init+0xfd2/0x1770 fs/9p/v9fs.c:497 v9fs_mount+0x73/0x910 fs/9p/vfs_super.c:135 syz-executor.1 (29127): drop_caches: 1 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 XFS (loop5): unknown mount option [noaliZ ×#²øQ†´Ò]. 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: 0033:0x7f94f781f0d9 Code: Bad RIP value. RSP: 002b:00007f94f5d91168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f94f793ef80 RCX: 00007f94f781f0d9 RDX: 0000000020000040 RSI: 0000000020000000 RDI: 0000000000000000 RBP: 00007f94f787aae9 R08: 00000000200001c0 R09: 0000000000000000 R10: 0000000000018001 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffec6eb660f R14: 00007f94f5d91300 R15: 0000000000022000 syz-executor.1 (29127): drop_caches: 1 Showing all locks held in the system: 3 locks held by kworker/u4:2/97: #0: 000000009fbe3448 ((wq_completion)"%s""netns"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 00000000d2a52f66 (net_cleanup_work){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 #2: 00000000cc146fd9 (pernet_ops_rwsem){++++}, at: cleanup_net+0xa8/0x8b0 net/core/net_namespace.c:521 1 lock held by khungtaskd/1572: #0: 000000001733e582 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 2 locks held by kworker/1:2/3535: #0: 0000000055f24153 ((wq_completion)"events"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 00000000fb77b21e ((work_completion)(&m->wq)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 1 lock held by in:imklog/7799: #0: 00000000c51c115b (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 1 lock held by syz-executor.3/29095: #0: 00000000c7ab732d (rcu_preempt_state.barrier_mutex){+.+.}, at: _rcu_barrier+0x59/0x3e0 kernel/rcu/tree.c:3430 1 lock held by syz-executor.0/29173: syz-executor.1 (29155): drop_caches: 1 #0: 000000001ecd68c7 (rcu_preempt_state.exp_mutex){+.+.}, at: exp_funnel_lock kernel/rcu/tree_exp.h:329 [inline] #0: 000000001ecd68c7 (rcu_preempt_state.exp_mutex){+.+.}, at: _synchronize_rcu_expedited+0x256/0x6f0 kernel/rcu/tree_exp.h:667 3 locks held by syz-executor.2/29161: #0: 000000009f102962 (&sb->s_type->i_mutex_key#13){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] #0: 000000009f102962 (&sb->s_type->i_mutex_key#13){+.+.}, at: __sock_release+0x86/0x2a0 net/socket.c:598 #1: 000000009d5b06dd (sk_lock-AF_CAN){+.+.}, at: lock_sock include/net/sock.h:1512 [inline] #1: 000000009d5b06dd (sk_lock-AF_CAN){+.+.}, at: bcm_release+0x1ff/0x950 net/can/bcm.c:1558 #2: 000000001ecd68c7 (rcu_preempt_state.exp_mutex){+.+.}, at: exp_funnel_lock kernel/rcu/tree_exp.h:297 [inline] #2: 000000001ecd68c7 (rcu_preempt_state.exp_mutex){+.+.}, at: _synchronize_rcu_expedited+0x4dc/0x6f0 kernel/rcu/tree_exp.h:667 2 locks held by syz-executor.1/29155: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1572 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 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 syz-executor.1 (29155): drop_caches: 1 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: 29186 Comm: systemd-udevd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:lock_acquire+0x1ec/0x3c0 kernel/locking/lockdep.c:3911 Code: 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 b7 01 00 00 48 83 3d 09 2e a6 08 00 0f 84 2a 01 00 00 48 8b 7c 24 08 57 9d <0f> 1f 44 00 00 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f c3 65 8b RSP: 0018:ffff88808f14fd08 EFLAGS: 00000286 RAX: 1ffffffff13e3051 RBX: ffff888043cd0100 RCX: 0000000000007448 RDX: dffffc0000000000 RSI: 000000002a50a961 RDI: 0000000000000286 RBP: ffff8880ae226358 R08: ffffffff8cd51780 R09: 0000000000000002 R10: ffff888043cd09d8 R11: 00000000632fe1a6 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001 FS: 00007ff2d8cc28c0(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffecfff8c20 CR3: 0000000098c9d000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144 spin_lock include/linux/spinlock.h:329 [inline] __d_add fs/dcache.c:2567 [inline] d_add+0x3e9/0x650 fs/dcache.c:2604 simple_lookup fs/libfs.c:68 [inline] simple_lookup+0xc9/0x110 fs/libfs.c:62 __lookup_hash+0x117/0x180 fs/namei.c:1547 do_unlinkat+0x295/0x660 fs/namei.c:4052 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7ff2d7b360e7 Code: f0 ff ff 73 01 c3 48 8b 0d ae bd 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 81 bd 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007ffecffeab78 EFLAGS: 00000246 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000564a86106760 RCX: 00007ff2d7b360e7 RDX: 00007ffecffeaa50 RSI: 00007ffecffeaa50 RDI: 00007ffecffeab80 RBP: 0000000000000b27 R08: 00000000000001c0 R09: 0000000000000014 R10: 00007ffecffeab80 R11: 0000000000000246 R12: 00007ffecffeab80 R13: 0000564a86106760 R14: 0000000000000003 R15: 000000000000000e