Hello, syzbot found the following issue on: HEAD commit: 4c388a8e740d Merge tag 'zstd-for-linus-5.16-rc1' of git://.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=143d2c06b00000 kernel config: https://syzkaller.appspot.com/x/.config?x=b7264d1cb8ba2795 dashboard link: https://syzkaller.appspot.com/bug?extid=5e403cab907a802d6a9f compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5e403cab907a802d6a9f@xxxxxxxxxxxxxxxxxxxxxxxxx INFO: task syz-executor.3:14593 blocked for more than 143 seconds. Not tainted 5.16.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:26472 pid:14593 ppid: 8449 flags:0x00004004 Call Trace: <TASK> context_switch kernel/sched/core.c:4972 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6253 schedule+0xd2/0x260 kernel/sched/core.c:6326 blk_mq_freeze_queue_wait+0x112/0x160 block/blk-mq.c:178 lo_release+0x160/0x1f0 drivers/block/loop.c:1768 blkdev_put_whole block/bdev.c:694 [inline] blkdev_put+0x2fb/0x9e0 block/bdev.c:956 btrfs_close_bdev fs/btrfs/volumes.c:1114 [inline] btrfs_close_bdev fs/btrfs/volumes.c:1104 [inline] btrfs_close_one_device fs/btrfs/volumes.c:1135 [inline] close_fs_devices+0x24f/0xa60 fs/btrfs/volumes.c:1178 btrfs_close_devices+0x8e/0x4b0 fs/btrfs/volumes.c:1193 open_ctree+0x48af/0x4954 fs/btrfs/disk-io.c:3700 btrfs_fill_super fs/btrfs/super.c:1359 [inline] btrfs_mount_root.cold+0x15/0x162 fs/btrfs/super.c:1726 legacy_get_tree+0x105/0x220 fs/fs_context.c:610 vfs_get_tree+0x89/0x2f0 fs/super.c:1500 fc_mount fs/namespace.c:994 [inline] vfs_kern_mount.part.0+0xd3/0x170 fs/namespace.c:1024 vfs_kern_mount+0x3c/0x60 fs/namespace.c:1011 btrfs_mount+0x234/0xa60 fs/btrfs/super.c:1786 legacy_get_tree+0x105/0x220 fs/fs_context.c:610 vfs_get_tree+0x89/0x2f0 fs/super.c:1500 do_new_mount fs/namespace.c:2988 [inline] path_mount+0x1320/0x1fa0 fs/namespace.c:3318 do_mount fs/namespace.c:3331 [inline] __do_sys_mount fs/namespace.c:3539 [inline] __se_sys_mount fs/namespace.c:3516 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3516 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fea85df401a RSP: 002b:00007fea83367fa8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000200009c0 RCX: 00007fea85df401a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fea83368000 RBP: 00007fea83368040 R08: 00007fea83368040 R09: 0000000020000000 R10: 0000000000010809 R11: 0000000000000206 R12: 0000000020000000 R13: 0000000020000100 R14: 00007fea83368000 R15: 00000000200005c0 </TASK> Showing all locks held in the system: 1 lock held by khungtaskd/26: #0: ffffffff8bb80fe0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458 1 lock held by in:imklog/6236: #0: ffff888020fea8f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 2 locks held by kworker/u4:12/12192: #0: ffff8880b9d39b18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2b/0x120 kernel/sched/core.c:478 #1: ffffc90004a7fdb0 ((work_completion)(&(&bat_priv->nc.work)->work)){+.+.}-{0:0}, at: process_one_work+0x8ca/0x1690 kernel/workqueue.c:2273 4 locks held by syz-executor.3/14593: #0: ffff88803a2da0e0 (&type->s_umount_key#73/1){+.+.}-{3:3}, at: alloc_super+0x1dd/0xac0 fs/super.c:229 #1: ffffffff8c25fc48 (uuid_mutex){+.+.}-{3:3}, at: btrfs_close_devices+0x86/0x4b0 fs/btrfs/volumes.c:1192 #2: ffff88801ad79118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0x97/0x9e0 block/bdev.c:914 #3: ffff88801adcab60 (&lo->lo_mutex){+.+.}-{3:3}, at: lo_release+0x4d/0x1f0 drivers/block/loop.c:1748 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 26 Comm: khungtaskd Not tainted 5.16.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0xc1d/0xf50 kernel/hung_task.c:295 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 </TASK> Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 2961 Comm: systemd-journal Not tainted 5.16.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:PageTail include/linux/page-flags.h:237 [inline] RIP: 0010:free_tail_pages_check+0x94/0x2d0 mm/page_alloc.c:1246 Code: b8 01 00 00 00 eb 4a 4c 8d 6e 08 4c 8d 66 18 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 00 0f 85 fb 01 00 00 <48> 8b 45 08 f7 d0 83 e0 01 0f 85 56 01 00 00 48 8b 4d 08 48 8d 51 RSP: 0018:ffffc90002057c58 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: ffffea00023df100 RCX: ffffffff81b2a420 RDX: 1ffffd400047be29 RSI: 0000000000000004 RDI: ffffea00023df154 RBP: ffffea00023df140 R08: 0000000000000000 R09: ffffea00023df157 R10: fffff9400047be2a R11: 000000000000001f R12: ffffea00023df158 R13: ffffea00023df148 R14: ffffea00023df154 R15: ffffea00023df100 FS: 00007f24420758c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f243f5be000 CR3: 00000000776d0000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> free_pages_prepare mm/page_alloc.c:1319 [inline] free_pcp_prepare+0x560/0x870 mm/page_alloc.c:1389 free_unref_page_prepare mm/page_alloc.c:3309 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3388 slab_destroy mm/slab.c:1627 [inline] slabs_destroy+0x89/0xc0 mm/slab.c:1647 cache_flusharray mm/slab.c:3418 [inline] ___cache_free+0x4cc/0x610 mm/slab.c:3480 qlink_free mm/kasan/quarantine.c:146 [inline] qlist_free_all+0x4e/0x110 mm/kasan/quarantine.c:165 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272 __kasan_slab_alloc+0x97/0xb0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:259 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc mm/slab.c:3323 [inline] kmem_cache_alloc+0x265/0x560 mm/slab.c:3507 getname_flags.part.0+0x50/0x4f0 fs/namei.c:138 getname_flags include/linux/audit.h:323 [inline] getname fs/namei.c:217 [inline] __do_sys_mkdir fs/namei.c:3929 [inline] __se_sys_mkdir fs/namei.c:3927 [inline] __x64_sys_mkdir+0xda/0x140 fs/namei.c:3927 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f2441330687 Code: 00 b8 ff ff ff ff c3 0f 1f 40 00 48 8b 05 09 d8 2b 00 64 c7 00 5f 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 d7 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007ffecd753e08 EFLAGS: 00000293 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007ffecd756e70 RCX: 00007f2441330687 RDX: 0000000000000000 RSI: 00000000000001ed RDI: 0000560cc21068c0 RBP: 00007ffecd753e40 R08: 0000560cc07433e5 R09: 0000000000000018 R10: 0000000000000069 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000001 R14: 0000560cc21068c0 R15: 00007ffecd754480 </TASK> ---------------- Code disassembly (best guess): 0: b8 01 00 00 00 mov $0x1,%eax 5: eb 4a jmp 0x51 7: 4c 8d 6e 08 lea 0x8(%rsi),%r13 b: 4c 8d 66 18 lea 0x18(%rsi),%r12 f: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 16: fc ff df 19: 4c 89 ea mov %r13,%rdx 1c: 48 c1 ea 03 shr $0x3,%rdx 20: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 24: 0f 85 fb 01 00 00 jne 0x225 * 2a: 48 8b 45 08 mov 0x8(%rbp),%rax <-- trapping instruction 2e: f7 d0 not %eax 30: 83 e0 01 and $0x1,%eax 33: 0f 85 56 01 00 00 jne 0x18f 39: 48 8b 4d 08 mov 0x8(%rbp),%rcx 3d: 48 rex.W 3e: 8d .byte 0x8d 3f: 51 push %rcx --- This report is generated by a bot. 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