audit: type=1804 audit(1566575515.488:118): pid=25187 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=invalid_pcr cause=ToMToU comm="syz-executor.0" name="/root/syzkaller-testdir688352136/syzkaller.jE1fXg/541/file0/file0" dev="loop0" ino=770 res=1
------------[ cut here ]------------
kernel BUG at fs/buffer.c:553!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
kobject: 'loop0' (0000000075658bc8): kobject_uevent_env
CPU: 0 PID: 25187 Comm: syz-executor.0 Not tainted 4.19.67 #41
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 ab db 3a 05 e9 ee fd ff ff e8 21 82 b2 ff <0f> 0b 4c 89 ff e8 77 15 e9 ff e9 d3 fd ff ff e8 6d 15 e9 ff e9 5b
kobject: 'loop0' (0000000075658bc8): fill_kobj_path: path = '/devices/virtual/block/loop0'
RSP: 0018:ffff88807e5775c0 EFLAGS: 00010246
RAX: 0000000000040000 RBX: ffff88809863a000 RCX: ffffc9000ae87000
RDX: 0000000000040000 RSI: ffffffff81b8dd0f RDI: ffff8880861b29a8
RBP: ffff88807e577600 R08: ffff8880305582c0 R09: ffffed1015d24733
R10: ffffed1015d24732 R11: ffff8880ae923993 R12: ffff8880861b2848
R13: 0000000000000000 R14: ffff8880a6e9fa98 R15: ffff888056b21280
FS:  00007fcd11935700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001443bf8 CR3: 000000009655f000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 fat16_ent_put+0xd2/0x110 fs/fat/fatent.c:182
 fat_free_clusters+0x3de/0x990 fs/fat/fatent.c:594
 fat_free fs/fat/file.c:384 [inline]
 fat_truncate_blocks+0x763/0xc10 fs/fat/file.c:402
 fat_setattr+0x806/0xc80 fs/fat/file.c:546
 notify_change+0xad7/0xfb0 fs/attr.c:334
 do_truncate+0x158/0x220 fs/open.c:63
 handle_truncate fs/namei.c:3008 [inline]
 do_last fs/namei.c:3424 [inline]
 path_openat+0x2c27/0x45e0 fs/namei.c:3534
 do_filp_open+0x1a1/0x280 fs/namei.c:3564
 do_sys_open+0x3fe/0x550 fs/open.c:1088
 ksys_open include/linux/syscalls.h:1276 [inline]
 __do_sys_creat fs/open.c:1146 [inline]
 __se_sys_creat fs/open.c:1144 [inline]
 __x64_sys_creat+0x61/0x80 fs/open.c:1144
 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459879
Code: fd b7 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fcd11934c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000459879
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000080
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fcd119356d4
R13: 00000000004bfee4 R14: 00000000004d1de0 R15: 00000000ffffffff
Modules linked in:
---[ end trace 800f716cb955b779 ]---
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 ab db 3a 05 e9 ee fd ff ff e8 21 82 b2 ff <0f> 0b 4c 89 ff e8 77 15 e9 ff e9 d3 fd ff ff e8 6d 15 e9 ff e9 5b
RSP: 0018:ffff88807e5775c0 EFLAGS: 00010246
kobject: 'loop0' (0000000075658bc8): kobject_uevent_env
RAX: 0000000000040000 RBX: ffff88809863a000 RCX: ffffc9000ae87000
RDX: 0000000000040000 RSI: ffffffff81b8dd0f RDI: ffff8880861b29a8
kobject: 'loop0' (0000000075658bc8): fill_kobj_path: path = '/devices/virtual/block/loop0'
RBP: ffff88807e577600 R08: ffff8880305582c0 R09: ffffed1015d24733
R10: ffffed1015d24732 R11: ffff8880ae923993 R12: ffff8880861b2848
R13: 0000000000000000 R14: ffff8880a6e9fa98 R15: ffff888056b21280
FS:  00007fcd11935700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001443bf8 CR3: 000000009655f000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400