------------[ cut here ]------------ kernel BUG at fs/buffer.c:3046! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 11423 Comm: syz-executor.0 Not tainted 4.20.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:submit_bh_wbc+0x515/0x6b0 fs/buffer.c:3046 Code: 93 fc ff 4c 89 ef e8 3a 2b 6f 01 31 c0 48 83 c4 20 5b 41 5c 41 5d 41 5e 41 5f 5d c3 f0 41 80 64 24 01 f7 e9 9a fb ff ff 0f 0b <0f> 0b 0f 0b 0f 0b 0f 0b 0f 0b e8 6c 07 eb ff e9 2c fe ff ff 48 89 RSP: 0018:ffff8880892479b8 EFLAGS: 00010246 RAX: 0000000000000005 RBX: 0000000000000800 RCX: 0000000000000000 RDX: 1ffff110126f3550 RSI: 0000000000000800 RDI: 0000000000000001 RBP: ffff888089247a00 R08: 0000000000000000 R09: ffffed10126f355c R10: ffffed10126f355c R11: ffff88809379aae3 R12: ffff88809379aa80 R13: 0000000000000800 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f9beaa32700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000758080 CR3: 00000000a62fa000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: submit_bh fs/buffer.c:3093 [inline] __sync_dirty_buffer+0xcd/0x230 fs/buffer.c:3179 sync_dirty_buffer+0xe/0x10 fs/buffer.c:3192 fat_set_state+0x1be/0x280 fs/fat/inode.c:702 fat_fill_super+0x1dc7/0x37e0 fs/fat/inode.c:1873 vfat_fill_super+0x15/0x20 fs/fat/namei_vfat.c:1049 mount_bdev+0x278/0x330 fs/super.c:1158 vfat_mount+0x10/0x20 fs/fat/namei_vfat.c:1056 mount_fs+0x7f/0x2a9 fs/super.c:1261 vfs_kern_mount.part.35+0x58/0x3d0 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2469 [inline] do_mount+0x36e/0x2410 fs/namespace.c:2801 ksys_mount+0xba/0xe0 fs/namespace.c:3017 __do_sys_mount fs/namespace.c:3031 [inline] __se_sys_mount fs/namespace.c:3028 [inline] __x64_sys_mount+0xb9/0x150 fs/namespace.c:3028 do_syscall_64+0xd0/0x4d0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45d36a Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 4d 8c fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 2a 8c fb ff c3 66 0f 1f 84 00 00 00 00 00 RSP: 002b:00007f9beaa31a68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000007 RCX: 000000000045d36a RDX: 00007f9beaa31ae0 RSI: 00000000200002c0 RDI: 00007f9beaa31b00 RBP: 000000000075bf20 R08: 00007f9beaa31b40 R09: 00007f9beaa31ae0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f9beaa326d4 R13: 00000000004cae75 R14: 00000000004e4378 R15: 00000000ffffffff Modules linked in: ---[ end trace 5e895aa2904e1ac1 ]--- RIP: 0010:submit_bh_wbc+0x515/0x6b0 fs/buffer.c:3046 Code: 93 fc ff 4c 89 ef e8 3a 2b 6f 01 31 c0 48 83 c4 20 5b 41 5c 41 5d 41 5e 41 5f 5d c3 f0 41 80 64 24 01 f7 e9 9a fb ff ff 0f 0b <0f> 0b 0f 0b 0f 0b 0f 0b 0f 0b e8 6c 07 eb ff e9 2c fe ff ff 48 89 RSP: 0018:ffff8880892479b8 EFLAGS: 00010246 RAX: 0000000000000005 RBX: 0000000000000800 RCX: 0000000000000000 RDX: 1ffff110126f3550 RSI: 0000000000000800 RDI: 0000000000000001 RBP: ffff888089247a00 R08: 0000000000000000 R09: ffffed10126f355c R10: ffffed10126f355c R11: ffff88809379aae3 R12: ffff88809379aa80 R13: 0000000000000800 R14: 0000000000000000 R15: 0000000000000000 kobject: 'loop3' (0000000026adfea9): kobject_uevent_env FS: 00007f9beaa32700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000018e0a78 CR3: 00000000a62fa000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 kobject: 'loop3' (0000000026adfea9): fill_kobj_path: path = '/devices/virtual/block/loop3'