syzbot


kernel BUG at include/linux/highmem.h:LINE!

Status: fixed on 2021/03/10 01:48
Reported-by: syzbot+dcb847a3e1e0ecd191ab@syzkaller.appspotmail.com
Fix commit: 0060ef3b4e6d mm: support THPs in zero_user_segments
First crash: 679d, last: 670d

Cause bisection: failed (bisect log)

Sample crash report:
------------[ cut here ]------------
kernel BUG at include/linux/highmem.h:202!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 8526 Comm: syz-executor603 Not tainted 5.10.0-rc4-next-20201117-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:zero_user_segments include/linux/highmem.h:202 [inline]
RIP: 0010:zero_user include/linux/highmem.h:223 [inline]
RIP: 0010:truncate_inode_partial_page+0x5aa/0x720 mm/truncate.c:264
Code: bc 01 00 00 00 e8 e6 f8 ff ff e9 e7 fe ff ff e8 2c 12 d8 ff 48 c7 c6 00 44 54 89 48 89 ef e8 dd b5 08 00 0f 0b e8 16 12 d8 ff <0f> 0b e8 0f 12 d8 ff 48 c7 c6 80 44 54 89 48 89 ef e8 c0 b5 08 00
RSP: 0018:ffffc90000f8fa00 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000200000 RCX: ffffffff81987fe1
RDX: ffff88801e614f80 RSI: ffffffff819882ca RDI: 0000000000000005
RBP: ffffea0000c70000 R08: 0000000000000000 R09: ffffea0000c70007
R10: 0000000000001000 R11: 0000000000000000 R12: 00000000001ffffa
R13: 00000000001ffffa R14: 0000000000000006 R15: ffffea0000c70008
FS:  0000000000e30880(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000043e920 CR3: 00000000228a7000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 shmem_undo_range+0x6fd/0x18f0 mm/shmem.c:921
 shmem_truncate_range mm/shmem.c:999 [inline]
 shmem_setattr+0x67a/0xc70 mm/shmem.c:1058
 notify_change+0xb60/0x10a0 fs/attr.c:336
 do_truncate+0x134/0x1f0 fs/open.c:64
 vfs_truncate+0x49e/0x600 fs/open.c:110
 do_sys_truncate.part.0+0x11e/0x140 fs/open.c:133
 do_sys_truncate fs/open.c:127 [inline]
 __do_sys_truncate fs/open.c:145 [inline]
 __se_sys_truncate fs/open.c:143 [inline]
 __x64_sys_truncate+0x69/0x90 fs/open.c:143
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x444109
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 db d7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffec4a90088 EFLAGS: 00000246 ORIG_RAX: 000000000000004c
RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000444109
RDX: 0000000000444109 RSI: 0000000000000006 RDI: 0000000020000040
RBP: 00000000006ce018 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000246 R12: 0000000000401d70
R13: 0000000000401e00 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace 910e59f95b39ab18 ]---
RIP: 0010:zero_user_segments include/linux/highmem.h:202 [inline]
RIP: 0010:zero_user include/linux/highmem.h:223 [inline]
RIP: 0010:truncate_inode_partial_page+0x5aa/0x720 mm/truncate.c:264
Code: bc 01 00 00 00 e8 e6 f8 ff ff e9 e7 fe ff ff e8 2c 12 d8 ff 48 c7 c6 00 44 54 89 48 89 ef e8 dd b5 08 00 0f 0b e8 16 12 d8 ff <0f> 0b e8 0f 12 d8 ff 48 c7 c6 80 44 54 89 48 89 ef e8 c0 b5 08 00
RSP: 0018:ffffc90000f8fa00 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000200000 RCX: ffffffff81987fe1
RDX: ffff88801e614f80 RSI: ffffffff819882ca RDI: 0000000000000005
RBP: ffffea0000c70000 R08: 0000000000000000 R09: ffffea0000c70007
R10: 0000000000001000 R11: 0000000000000000 R12: 00000000001ffffa
R13: 00000000001ffffa R14: 0000000000000006 R15: ffffea0000c70008
FS:  0000000000e30880(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000043e920 CR3: 00000000228a7000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (32):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-linux-next-kasan-gce-root 2020/11/17 22:44 linux-next 7c8ca8129ee9 bd2a760b .config log report syz C
ci-upstream-linux-next-kasan-gce-root 2020/11/26 07:00 linux-next 62918e6fd7b5 2f1cec62 .config log report info
ci-upstream-linux-next-kasan-gce-root 2020/11/26 02:30 linux-next 62918e6fd7b5 2f1cec62 .config log report info
ci-upstream-linux-next-kasan-gce-root 2020/11/26 02:27 linux-next 62918e6fd7b5 2f1cec62 .config log report info
ci-upstream-linux-next-kasan-gce-root 2020/11/26 01:40 linux-next 62918e6fd7b5 2f1cec62 .config log report info
ci-upstream-linux-next-kasan-gce-root 2020/11/25 01:55 linux-next 62918e6fd7b5 e34b696c .config log report info
ci-upstream-linux-next-kasan-gce-root 2020/11/25 01:40 linux-next 62918e6fd7b5 e34b696c .config log report info
ci-upstream-linux-next-kasan-gce-root 2020/11/23 08:15 linux-next 95065cb54210 0d27f508 .config log report info
ci-upstream-linux-next-kasan-gce-root 2020/11/20 10:05 linux-next 95065cb54210 0767f13f .config log report info
ci-upstream-linux-next-kasan-gce-root 2020/11/20 10:00 linux-next 95065cb54210 0767f13f .config log report info
ci-upstream-linux-next-kasan-gce-root 2020/11/19 00:14 linux-next 205292332779 0767f13f .config log report info
ci-upstream-linux-next-kasan-gce-root 2020/11/17 15:37 linux-next 7c8ca8129ee9 bd2a760b .config log report info
ci-upstream-linux-next-kasan-gce-root 2020/11/17 15:30 linux-next 7c8ca8129ee9 bd2a760b .config log report info
ci-upstream-linux-next-kasan-gce-root 2020/11/17 15:20 linux-next 7c8ca8129ee9 bd2a760b .config log report info
ci-upstream-linux-next-kasan-gce-root 2020/11/17 15:07 linux-next 7c8ca8129ee9 bd2a760b .config log report info
ci-upstream-linux-next-kasan-gce-root 2020/11/17 15:07 linux-next 7c8ca8129ee9 bd2a760b .config log report info
ci-upstream-linux-next-kasan-gce-root 2020/11/17 15:04 linux-next 7c8ca8129ee9 bd2a760b .config log report info
ci-upstream-linux-next-kasan-gce-root 2020/11/17 15:02 linux-next 7c8ca8129ee9 bd2a760b .config log report info
ci-upstream-linux-next-kasan-gce-root 2020/11/17 14:57 linux-next 7c8ca8129ee9 bd2a760b .config log report info
ci-upstream-linux-next-kasan-gce-root 2020/11/17 14:44 linux-next 7c8ca8129ee9 bd2a760b .config log report info
ci-upstream-linux-next-kasan-gce-root 2020/11/17 14:41 linux-next 7c8ca8129ee9 bd2a760b .config log report info
ci-upstream-linux-next-kasan-gce-root 2020/11/17 14:27 linux-next 7c8ca8129ee9 bd2a760b .config log report info
ci-upstream-linux-next-kasan-gce-root 2020/11/17 14:18 linux-next 7c8ca8129ee9 bd2a760b .config log report info
ci-upstream-linux-next-kasan-gce-root 2020/11/17 13:52 linux-next 7c8ca8129ee9 bd2a760b .config log report info
ci-upstream-linux-next-kasan-gce-root 2020/11/17 13:47 linux-next 7c8ca8129ee9 bd2a760b .config log report info
ci-upstream-linux-next-kasan-gce-root 2020/11/17 13:45 linux-next 7c8ca8129ee9 bd2a760b .config log report info
ci-upstream-linux-next-kasan-gce-root 2020/11/17 13:29 linux-next 7c8ca8129ee9 bd2a760b .config log report info
ci-upstream-linux-next-kasan-gce-root 2020/11/17 13:27 linux-next 7c8ca8129ee9 bd2a760b .config log report info
ci-upstream-linux-next-kasan-gce-root 2020/11/17 13:26 linux-next 7c8ca8129ee9 bd2a760b .config log report info
ci-upstream-linux-next-kasan-gce-root 2020/11/17 13:12 linux-next 7c8ca8129ee9 bd2a760b .config log report info
ci-upstream-linux-next-kasan-gce-root 2020/11/17 13:03 linux-next 7c8ca8129ee9 bd2a760b .config log report info
ci-upstream-linux-next-kasan-gce-root 2020/11/17 13:03 linux-next 7c8ca8129ee9 bd2a760b .config log report info
* Struck through repros no longer work on HEAD.