WARNING in ext4_invalidatepage

syzbot
2018-10-08T16:18:06Z

Hello,

syzbot found the following crash on:

HEAD commit: c1d84a1b42ef Merge git://git.kernel.org/pub/scm/linux/kern..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=161588d6400000
kernel config: https://syzkaller.appspot.com/x/.config?x=c0af03fe452b65fb
dashboard link: https://syzkaller.appspot.com/bug?extid=85da7ac734f7ba432ee4
compiler: gcc (GCC) 8.0.1 20180413 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+85da7ac734f7ba432ee4@syzkaller.appspotmail.com

WARNING: CPU: 1 PID: 17203 at fs/ext4/inode.c:3353
ext4_invalidatepage+0x1c7/0x5b0 fs/ext4/inode.c:3353
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 17203 Comm: syz-executor5 Not tainted 4.19.0-rc6+ #48
kobject: 'loop3' (000000002393f9b0): kobject_uevent_env
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+0x1c4/0x2b4 lib/dump_stack.c:113
kobject: 'loop3' (000000002393f9b0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
panic+0x238/0x4e7 kernel/panic.c:184
__warn.cold.8+0x163/0x1ba kernel/panic.c:536
report_bug+0x254/0x2d0 lib/bug.c:186
fixup_bug arch/x86/kernel/traps.c:178 [inline]
do_error_trap+0x1fc/0x4d0 arch/x86/kernel/traps.c:296
do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316
invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:993
RIP: 0010:ext4_invalidatepage+0x1c7/0x5b0 fs/ext4/inode.c:3353
Code: 80 3c 02 00 0f 85 a7 03 00 00 4d 8b 6d 00 31 ff 49 c1 ed 11 41 83 e5
01 4c 89 ee e8 43 ea 67 ff 4d 85 ed 74 07 e8 09 e9 67 ff <0f> 0b e8 02 e9
67 ff 8b b5 34 ff ff ff 44 89 fa 4c 89 e7 e8 91 3a
RSP: 0018:ffff88018590ec78 EFLAGS: 00010212
RAX: 0000000000040000 RBX: 1ffff10030b21d91 RCX: ffffc9000dae4000
RDX: 0000000000000ece RSI: ffffffff8216ec87 RDI: 0000000000000007
RBP: ffff88018590ed50 R08: ffff880183018300 R09: fffff94000ceffc6
R10: fffff94000ceffc6 R11: ffffea000677fe33 R12: ffffea000677fe00
R13: 0000000000000001 R14: ffffea000677fe08 R15: 0000000000001000
do_invalidatepage mm/truncate.c:165 [inline]
truncate_cleanup_page+0x5ac/0xa90 mm/truncate.c:187
truncate_inode_page+0x107/0x1a0 mm/truncate.c:229
truncate_inode_pages_range+0x1382/0x2d50 mm/truncate.c:451
truncate_inode_pages+0x24/0x30 mm/truncate.c:478
swap_inode_boot_loader fs/ext4/ioctl.c:123 [inline]
ext4_ioctl+0x1e3b/0x4210 fs/ext4/ioctl.c:865
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:501 [inline]
do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:685
ksys_ioctl+0xa9/0xd0 fs/ioctl.c:702
__do_sys_ioctl fs/ioctl.c:709 [inline]
__se_sys_ioctl fs/ioctl.c:707 [inline]
__x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:707
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457579
Code: 1d b4 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 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fa151655c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457579
RDX: 0000000020000000 RSI: 0000000000006611 RDI: 0000000000000006
RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa1516566d4
R13: 00000000004bf60e R14: 00000000004cf4a8 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..

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