------------[ cut here ]------------ kernel BUG at fs/buffer.c:553! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 13013 Comm: syz-executor.0 Not tainted 4.19.40 #8 kobject: 'loop4' (0000000096f9265d): kobject_uevent_env Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:mark_buffer_dirty_inode fs/buffer.c:553 [inline] RIP: 0010:mark_buffer_dirty_inode+0x30f/0x410 fs/buffer.c:544 Code: 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 75 4d 4c 89 63 58 4c 89 ef e8 8b 03 38 05 e9 ee fd ff ff e8 91 ab b2 ff <0f> 0b 4c 89 ff e8 f7 21 e9 ff e9 d3 fd ff ff e8 ed 21 e9 ff e9 5b loop_reread_partitions: partition scan of loop0 (pàõ|Œö' $äé>Bªå‡TÁÕœÈ) failed (rc=-16) RSP: 0018:ffff888055266d28 EFLAGS: 00010246 RAX: 0000000000040000 RBX: ffff88805d27b7e0 RCX: ffffc90005e77000 RDX: 0000000000040000 RSI: ffffffff81b8d50f RDI: ffff88805d1a3ee0 RBP: ffff888055266d68 R08: ffff888056422100 R09: 0000000000000003 R10: ffffed1015d24732 R11: ffff8880ae923993 R12: ffff88805d1a3d80 R13: 0000000000000000 R14: ffff8880a6cc73d8 R15: ffff888055267010 FS: 00007f5fcc6d9700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b32d23000 CR3: 00000000a0ad5000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 kobject: 'loop4' (0000000096f9265d): fill_kobj_path: path = '/devices/virtual/block/loop4' DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: fat16_ent_put+0xd2/0x110 fs/fat/fatent.c:182 fat_alloc_clusters+0x63e/0xf40 fs/fat/fatent.c:500 fat_add_cluster+0x6f/0x100 fs/fat/inode.c:101 kobject: 'loop1' (0000000046e97258): kobject_uevent_env kobject: 'loop1' (0000000046e97258): fill_kobj_path: path = '/devices/virtual/block/loop1' __fat_get_block fs/fat/inode.c:148 [inline] fat_get_block+0x344/0x970 fs/fat/inode.c:183 __block_write_begin_int+0x4e0/0x1920 fs/buffer.c:1967 kobject: 'loop3' (00000000f349b21d): kobject_uevent_env kobject: 'loop3' (00000000f349b21d): fill_kobj_path: path = '/devices/virtual/block/loop3' __block_write_begin fs/buffer.c:2017 [inline] block_write_begin+0x5f/0x1e0 fs/buffer.c:2076 cont_write_begin+0x4fa/0x8c0 fs/buffer.c:2429 fat_write_begin+0x8d/0x120 fs/fat/inode.c:229 generic_perform_write+0x231/0x530 mm/filemap.c:3139 __generic_file_write_iter+0x25e/0x630 mm/filemap.c:3264 generic_file_write_iter+0x383/0x730 mm/filemap.c:3292 call_write_iter include/linux/fs.h:1817 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x58e/0x820 fs/read_write.c:487 __kernel_write+0x110/0x390 fs/read_write.c:506 write_pipe_buf+0x15d/0x1f0 fs/splice.c:798 splice_from_pipe_feed fs/splice.c:503 [inline] __splice_from_pipe+0x39a/0x7e0 fs/splice.c:627 splice_from_pipe+0x108/0x170 fs/splice.c:662 default_file_splice_write+0x3c/0x90 fs/splice.c:810 do_splice_from fs/splice.c:852 [inline] direct_splice_actor+0x126/0x1a0 fs/splice.c:1019 splice_direct_to_actor+0x2ea/0x890 fs/splice.c:974 do_splice_direct+0x1da/0x2a0 fs/splice.c:1062 do_sendfile+0x597/0xce0 fs/read_write.c:1446 __do_sys_sendfile64 fs/read_write.c:1501 [inline] __se_sys_sendfile64 fs/read_write.c:1493 [inline] __x64_sys_sendfile64+0x15a/0x220 fs/read_write.c:1493 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458da9 Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f5fcc6d8c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000458da9 RDX: 0000000020000000 RSI: 0000000000000004 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 00008080fffffffe R11: 0000000000000246 R12: 00007f5fcc6d96d4 R13: 00000000004c5fa3 R14: 00000000004da748 R15: 00000000ffffffff Modules linked in: ---[ end trace 61665b5cc1d41589 ]--- RIP: 0010:mark_buffer_dirty_inode fs/buffer.c:553 [inline] RIP: 0010:mark_buffer_dirty_inode+0x30f/0x410 fs/buffer.c:544 Code: 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 75 4d 4c 89 63 58 4c 89 ef e8 8b 03 38 05 e9 ee fd ff ff e8 91 ab b2 ff <0f> 0b 4c 89 ff e8 f7 21 e9 ff e9 d3 fd ff ff e8 ed 21 e9 ff e9 5b RSP: 0018:ffff888055266d28 EFLAGS: 00010246 RAX: 0000000000040000 RBX: ffff88805d27b7e0 RCX: ffffc90005e77000 RDX: 0000000000040000 RSI: ffffffff81b8d50f RDI: ffff88805d1a3ee0 kobject: 'loop2' (00000000631dce8b): kobject_uevent_env print_req_error: I/O error, dev loop0, sector 0 print_req_error: I/O error, dev loop0, sector 0 kobject: 'loop2' (00000000631dce8b): fill_kobj_path: path = '/devices/virtual/block/loop2' Buffer I/O error on dev loop0, logical block 0, async page read print_req_error: I/O error, dev loop0, sector 0 Buffer I/O error on dev loop0, logical block 0, async page read print_req_error: I/O error, dev loop0, sector 0 Buffer I/O error on dev loop0, logical block 0, async page read print_req_error: I/O error, dev loop0, sector 0 Buffer I/O error on dev loop0, logical block 0, async page read kobject: 'loop1' (0000000046e97258): kobject_uevent_env print_req_error: I/O error, dev loop0, sector 0 Buffer I/O error on dev loop0, logical block 0, async page read print_req_error: I/O error, dev loop0, sector 0 Buffer I/O error on dev loop0, logical block 0, async page read kobject: 'loop1' (0000000046e97258): fill_kobj_path: path = '/devices/virtual/block/loop1' print_req_error: I/O error, dev loop0, sector 0 Buffer I/O error on dev loop0, logical block 0, async page read print_req_error: I/O error, dev loop0, sector 0 Buffer I/O error on dev loop0, logical block 0, async page read print_req_error: I/O error, dev loop0, sector 0 Buffer I/O error on dev loop0, logical block 0, async page read RBP: ffff888055266d68 R08: ffff888056422100 R09: 0000000000000003 Buffer I/O error on dev loop0, logical block 0, async page read R10: ffffed1015d24732 R11: ffff8880ae923993 R12: ffff88805d1a3d80 R13: 0000000000000000 R14: ffff8880a6cc73d8 R15: ffff888055267010 kobject: 'loop5' (000000006040a904): kobject_uevent_env FS: 00007f5fcc6d9700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 kobject: 'loop5' (000000006040a904): fill_kobj_path: path = '/devices/virtual/block/loop5' CR2: 000000000070d158 CR3: 00000000a0ad5000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400