INFO: task syz-executor.5:28678 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.5 D29576 28678 28412 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 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:589 [inline] rwsem_down_write_failed+0x3aa/0x760 kernel/locking/rwsem-xadd.c:618 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0x4f/0x90 kernel/locking/rwsem.c:72 grab_super+0xa2/0x350 fs/super.c:383 sget_userns+0x352/0xcd0 fs/super.c:511 sget+0x102/0x140 fs/super.c:570 mount_bdev+0xf8/0x3b0 fs/super.c:1131 netlink: 68 bytes leftover after parsing attributes in process `syz-executor.0'. 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: 0033:0x7f93a6de00f9 Code: Bad RIP value. RSP: 002b:00007f93a5310168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f93a6f00120 RCX: 00007f93a6de00f9 RDX: 0000000020000180 RSI: 0000000020000140 RDI: 00000000200000c0 RBP: 00007f93a6e3bae9 R08: 00000000200011c0 R09: 0000000000000000 R10: 0000000000000804 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdd717a71f R14: 00007f93a5310300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1570: #0: 000000007708560d (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by in:imklog/7766: #0: 00000000bfe16dc7 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 2 locks held by syz-executor.5/28311: 2 locks held by syz-executor.5/28678: #0: 00000000c783c9a1 (&bdev->bd_fsfreeze_mutex){+.+.}, at: mount_bdev+0x90/0x3b0 fs/super.c:1125 #1: 000000003936e812 (&type->s_umount_key#55){+.+.}, at: grab_super+0xa2/0x350 fs/super.c:383 1 lock held by syz-executor.3/951: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 8179 Comm: syz-executor.4 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023 RIP: 0010:_raw_spin_lock+0x1/0x40 kernel/locking/spinlock.c:143 Code: 82 f1 89 e8 71 16 7f f9 e9 2d fe ff ff 48 89 df e8 64 16 7f f9 e9 63 fe ff ff 4c 89 ef e8 77 17 7f f9 e9 2e ff ff ff 90 90 55 <48> 89 fd bf 01 00 00 00 e8 02 22 28 f9 45 31 c9 41 b8 01 00 00 00 RSP: 0018:ffff88808f27fbe8 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffff88823b843380 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffea0002446b80 RDI: ffff88813be79b00 RBP: ffffea0002446b80 R08: 0000000000000000 R09: 0000000000000002 R10: 0000000000000007 R11: 0000000000000000 R12: ffff88813be79b00 R13: ffffea0002446b88 R14: ffffe8ffffc02d80 R15: ffff88823b843380 FS: 0000555557323400(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055555732c848 CR3: 0000000093f4c000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: spin_lock include/linux/spinlock.h:329 [inline] cache_grow_end+0x46/0x170 mm/slab.c:2737 cache_alloc_refill+0x2f8/0x340 mm/slab.c:3058 ____cache_alloc mm/slab.c:3132 [inline] __do_cache_alloc mm/slab.c:3354 [inline] slab_alloc mm/slab.c:3389 [inline] kmem_cache_alloc+0x346/0x370 mm/slab.c:3557 getname_flags+0xce/0x590 fs/namei.c:140 user_path_at_empty+0x2a/0x50 fs/namei.c:2609 user_path_at include/linux/namei.h:57 [inline] vfs_statx+0x113/0x210 fs/stat.c:185 vfs_lstat include/linux/fs.h:3137 [inline] __do_sys_newlstat fs/stat.c:350 [inline] __se_sys_newlstat+0x96/0x120 fs/stat.c:344 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f43a287c0a6 Code: ff ff ff 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 41 89 f8 48 89 f7 48 89 d6 41 83 f8 01 77 29 b8 06 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 02 c3 90 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 RSP: 002b:00007ffc80a93a88 EFLAGS: 00000246 ORIG_RAX: 0000000000000006 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f43a287c0a6 RDX: 00007ffc80a93ac0 RSI: 00007ffc80a93ac0 RDI: 00007ffc80a93b50 RBP: 00007ffc80a93b50 R08: 0000000000000001 R09: 00007ffc80a93920 R10: 00005555573248e3 R11: 0000000000000246 R12: 00007f43a28d7b24 R13: 00007ffc80a94c10 R14: 0000555557324810 R15: 00007ffc80a94c50