Hello, syzbot found the following issue on: HEAD commit: 09f6b0c8904b Merge tag 'linux_kselftest-fixes-6.12-rc3' of.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14af3fd0580000 kernel config: https://syzkaller.appspot.com/x/.config?x=7cd9e7e4a8a0a15b dashboard link: https://syzkaller.appspot.com/bug?extid=611be8174be36ca5dbc9 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16c7705f980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14d2fb27980000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-09f6b0c8.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/3844cfd6d6b9/vmlinux-09f6b0c8.xz kernel image: https://storage.googleapis.com/syzbot-assets/8752e101c1ff/bzImage-09f6b0c8.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/5410decf46fa/mount_1.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+611be8174be36ca5dbc9@xxxxxxxxxxxxxxxxxxxxxxxxx INFO: task syz-executor279:5128 blocked for more than 143 seconds. Not tainted 6.12.0-rc2-syzkaller-00291-g09f6b0c8904b #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor279 state:D stack:25488 pid:5128 tgid:5105 ppid:5102 flags:0x00004006 Call Trace: <TASK> context_switch kernel/sched/core.c:5322 [inline] __schedule+0x1895/0x4b30 kernel/sched/core.c:6682 __schedule_loop kernel/sched/core.c:6759 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6774 xfs_ail_push_all_sync+0x236/0x310 fs/xfs/xfs_trans_ail.c:726 xfs_log_quiesce+0xdf/0x5b0 fs/xfs/xfs_log.c:1018 xfs_fs_freeze+0x8d/0x1a0 fs/xfs/xfs_super.c:936 freeze_super+0x81b/0xee0 fs/super.c:2107 fs_bdev_freeze+0x1ac/0x320 fs/super.c:1484 bdev_freeze+0xd6/0x220 block/bdev.c:257 xfs_fs_goingdown+0xa9/0x160 fs/xfs/xfs_fsops.c:446 xfs_file_ioctl+0x12e5/0x1a30 fs/xfs/xfs_ioctl.c:1343 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f70924b2539 RSP: 002b:00007f709243f168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f709253c6d8 RCX: 00007f70924b2539 RDX: 0000000020000080 RSI: 000000008004587d RDI: 0000000000000005 RBP: 00007f709253c6d0 R08: 00007f709243f6c0 R09: 0000000000000000 R10: 00007f709243f6c0 R11: 0000000000000246 R12: 00007f709253c6dc R13: 000000000000006e R14: 00007ffd410540a0 R15: 00007ffd41054188 </TASK> Showing all locks held in the system: 1 lock held by khungtaskd/25: #0: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6720 2 locks held by getty/4897: #0: ffff88801e2510a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc9000039b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211 5 locks held by syz-executor279/5128: #0: ffff888031ccc6b0 (&bdev->bd_fsfreeze_mutex){+.+.}-{3:3}, at: bdev_freeze+0x2a/0x220 block/bdev.c:248 #1: ffff888011c84420 (sb_writers#10){++++}-{0:0}, at: sb_wait_write fs/super.c:1896 [inline] #1: ffff888011c84420 (sb_writers#10){++++}-{0:0}, at: freeze_super+0x4e9/0xee0 fs/super.c:2085 #2: ffff888011c840e0 (&type->s_umount_key#44){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline] #2: ffff888011c840e0 (&type->s_umount_key#44){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #2: ffff888011c840e0 (&type->s_umount_key#44){+.+.}-{3:3}, at: freeze_super+0x4f1/0xee0 fs/super.c:2086 #3: ffff888011c84518 (sb_pagefaults#2){+.+.}-{0:0}, at: sb_wait_write fs/super.c:1896 [inline] #3: ffff888011c84518 (sb_pagefaults#2){+.+.}-{0:0}, at: freeze_super+0x519/0xee0 fs/super.c:2090 #4: ffff888011c84610 (sb_internal#2){++++}-{0:0}, at: sb_wait_write fs/super.c:1896 [inline] #4: ffff888011c84610 (sb_internal#2){++++}-{0:0}, at: freeze_super+0x7cc/0xee0 fs/super.c:2104 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 25 Comm: khungtaskd Not tainted 6.12.0-rc2-syzkaller-00291-g09f6b0c8904b #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline] watchdog+0xff4/0x1040 kernel/hung_task.c:379 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
