gfs2: fsid=syz:syz.0: jid=0, already locked for use gfs2: fsid=syz:syz.0: jid=0: Looking at journal... gfs2: fsid=syz:syz.0: jid=0: Done gfs2: fsid=syz:syz.0: first mount done, others may mount XFS (loop5): Invalid superblock magic number WARNING: CPU: 1 PID: 11307 at kernel/workqueue.c:2628 flush_workqueue_prep_pwqs+0x365/0x570 kernel/workqueue.c:2628 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 11307 Comm: syz-executor.5 Not tainted 4.19.183-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 panic+0x26a/0x50e kernel/panic.c:186 __warn.cold+0x20/0x5a kernel/panic.c:541 report_bug+0x262/0x2b0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] fixup_bug arch/x86/kernel/traps.c:173 [inline] do_error_trap+0x1d7/0x310 arch/x86/kernel/traps.c:296 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038 RIP: 0010:flush_workqueue_prep_pwqs+0x365/0x570 kernel/workqueue.c:2628 Code: e6 24 00 45 85 ed 0f 89 05 01 00 00 e8 c4 e4 24 00 0f b6 44 24 27 48 83 c4 30 5b 5d 41 5c 41 5d 41 5e 41 5f c3 e8 ab e4 24 00 <0f> 0b e9 a3 fd ff ff e8 9f e4 24 00 0f 0b e9 a6 fe ff ff e8 93 e4 RSP: 0018:ffff8880aaf07988 EFLAGS: 00010016 RAX: 0000000000040000 RBX: ffffe8ffffdac400 RCX: ffffc90010710000 RDX: 00000000000125cb RSI: ffffffff813d78b5 RDI: 0000000000000004 RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000004 R11: 0000000000000000 R12: 0000000000000001 R13: 0000000000000000 R14: ffff8880ba12ac40 R15: ffff88805b6eec80 flush_workqueue+0x54f/0x13e0 kernel/workqueue.c:2686 drain_workqueue+0x1a5/0x460 kernel/workqueue.c:2825 destroy_workqueue+0x75/0x790 kernel/workqueue.c:4176 xfs_destroy_mount_workqueues+0x93/0x1c0 fs/xfs/xfs_super.c:901 xfs_fs_fill_super+0x8ac/0x1540 fs/xfs/xfs_super.c:1746 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:2469 [inline] do_mount+0x113c/0x2f10 fs/namespace.c:2799 ksys_mount+0xcf/0x130 fs/namespace.c:3015 __do_sys_mount fs/namespace.c:3029 [inline] __se_sys_mount fs/namespace.c:3026 [inline] __x64_sys_mount+0xba/0x150 fs/namespace.c:3026 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x46797a Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff7d0aebfa8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 000000000046797a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ff7d0aec000 RBP: 00007ff7d0aec040 R08: 00007ff7d0aec040 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000 R13: 0000000020000100 R14: 00007ff7d0aec000 R15: 0000000020212b00 Kernel Offset: disabled Rebooting in 86400 seconds..