syzbot


kernel BUG in __filemap_get_folio

Status: upstream: reported C repro on 2022/04/20 15:54
Reported-by: syzbot+cf4cf13056f85dec2c40@syzkaller.appspotmail.com
Fix commit: 63b1898fffcd XArray: Disallow sibling entries of nodes
Patched on: [ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-leak ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce ci-upstream-kmsan-gce-386 ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-kcsan-gce ci2-upstream-usb], missing on: [ci-qemu2-riscv64]
First crash: 70d, last: 2d01h

Cause bisection: introduced by (bisect log) :
commit 6b24ca4a1a8d4ee3221d6d44ddbb99f542e4bda3
Author: Matthew Wilcox (Oracle) <willy@infradead.org>
Date: Sun Jun 28 02:19:08 2020 +0000

  mm: Use multi-index entries in the page cache

Crash: kernel BUG in __filemap_get_folio (log)
Repro: C syz .config
similar bugs (4):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream kernel BUG in find_lock_entries C done 10 160d 323d 22/22 fixed on 2022/03/08 16:11
upstream kernel BUG at mm/filemap.c:LINE! (2) 1 591d 587d 0/22 auto-closed as invalid on 2021/03/15 06:14
android-44 kernel BUG at mm/filemap.c:LINE! C 1082 1399d 1174d 0/2 public: reported C repro on 2019/04/11 08:44
upstream kernel BUG at mm/filemap.c:LINE! 1 1220d 1219d 0/22 auto-closed as invalid on 2019/08/24 03:17
Patch testing requests:
Created Duration User Patch Repo Result
2022/04/22 18:30 17m willy@infradead.org git://git.infradead.org/users/willy/xarray.git main OK
2022/04/22 12:52 17m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/ 559089e0a93d OK
2022/04/22 12:17 9m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/ 559089e0a93d report log
2022/04/22 07:04 9m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/ 559089e0a93d report log
2022/04/22 02:30 9m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/ 559089e0a93d report log
2022/04/22 00:14 9m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/ 559089e0a93d report log

Sample crash report:
 do_initcall_level init/main.c:1371 [inline]
 do_initcalls init/main.c:1387 [inline]
 do_basic_setup init/main.c:1406 [inline]
 kernel_init_freeable+0x6b1/0x73a init/main.c:1613
 kernel_init+0x1a/0x1d0 init/main.c:1502
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
------------[ cut here ]------------
kernel BUG at mm/filemap.c:1971!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 3867 Comm: syz-executor935 Not tainted 5.18.0-rc3-syzkaller-00007-g559089e0a93d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__filemap_get_folio+0xc65/0xf00 mm/filemap.c:1971
Code: db 45 31 f6 e9 fd f5 ff ff 44 8b 6c 24 10 48 89 eb e9 f0 f5 ff ff e8 ba f5 d8 ff 48 c7 c6 80 d9 d5 89 48 89 df e8 6b 8d 0e 00 <0f> 0b e8 a4 f5 d8 ff 48 89 df 31 db e8 4a af 03 00 e9 78 f7 ff ff
RSP: 0018:ffffc900033d78b0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffffea00014c8dc0 RCX: 0000000000000000
RDX: ffff88807bb560c0 RSI: ffffffff819f5865 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000018 R09: 00000000ffffffff
R10: ffffffff891d5eec R11: 00000000ffffffff R12: 0000000000000180
R13: 0000000000000182 R14: 0000000000000000 R15: dffffc0000000000
FS:  00007f78863e0700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002013f000 CR3: 0000000075648000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 pagecache_get_page+0x2e/0x290 mm/folio-compat.c:126
 shmem_getpage_gfp+0x471/0x2370 mm/shmem.c:1812
 shmem_getpage mm/shmem.c:149 [inline]
 shmem_write_begin+0xff/0x1e0 mm/shmem.c:2446
 generic_perform_write+0x249/0x560 mm/filemap.c:3787
 __generic_file_write_iter+0x2aa/0x4d0 mm/filemap.c:3915
 generic_file_write_iter+0xd7/0x220 mm/filemap.c:3947
 call_write_iter include/linux/fs.h:2050 [inline]
 new_sync_write+0x38a/0x560 fs/read_write.c:504
 vfs_write+0x7c0/0xac0 fs/read_write.c:591
 ksys_write+0x127/0x250 fs/read_write.c:644
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f78864331c9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 41 15 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f78863e0308 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f78864b73e8 RCX: 00007f78864331c9
RDX: 000000000208e24b RSI: 0000000020000080 RDI: 0000000000000004
RBP: 00007f78864b73e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f78864b73ec
R13: 00007f78864840ac R14: 776c613d65677568 R15: 0000000000022000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__filemap_get_folio+0xc65/0xf00 mm/filemap.c:1971
Code: db 45 31 f6 e9 fd f5 ff ff 44 8b 6c 24 10 48 89 eb e9 f0 f5 ff ff e8 ba f5 d8 ff 48 c7 c6 80 d9 d5 89 48 89 df e8 6b 8d 0e 00 <0f> 0b e8 a4 f5 d8 ff 48 89 df 31 db e8 4a af 03 00 e9 78 f7 ff ff
RSP: 0018:ffffc900033d78b0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffffea00014c8dc0 RCX: 0000000000000000
RDX: ffff88807bb560c0 RSI: ffffffff819f5865 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000018 R09: 00000000ffffffff
R10: ffffffff891d5eec R11: 00000000ffffffff R12: 0000000000000180
R13: 0000000000000182 R14: 0000000000000000 R15: dffffc0000000000
FS:  00007f78863e0700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020800000 CR3: 0000000075648000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (811):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-selinux-root 2022/04/20 04:16 upstream 559089e0a93d 7d7bc738 .config log report syz C kernel BUG in __filemap_get_folio
ci-upstream-kasan-gce-smack-root 2022/04/22 00:13 upstream 59f0c2447e25 2738b391 .config log report info kernel BUG in __filemap_get_folio
ci-upstream-kasan-gce-selinux-root 2022/04/21 00:37 upstream b253435746d9 d4befee1 .config log report info kernel BUG in __filemap_get_folio
ci-upstream-kasan-gce-selinux-root 2022/04/19 22:35 upstream 559089e0a93d 7d7bc738 .config log report info kernel BUG in __filemap_get_folio
ci-upstream-linux-next-kasan-gce-root 2022/06/27 05:36 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/27 05:17 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/27 03:22 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/27 02:29 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/27 01:17 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/26 23:32 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/26 22:25 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/26 20:15 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/26 18:53 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/26 17:50 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/26 15:47 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/26 14:29 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/26 12:40 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/26 11:36 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/26 10:52 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/26 09:18 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/26 08:07 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/26 06:45 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/26 05:48 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/26 05:02 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/26 03:58 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/26 02:55 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/26 01:56 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/26 00:52 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/25 23:49 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/25 23:38 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/25 22:33 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/25 21:27 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/25 19:50 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/25 18:14 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/25 17:13 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/25 15:13 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/25 15:01 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/25 13:59 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/25 13:50 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/25 12:40 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/25 11:34 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/25 11:13 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/25 09:52 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/25 08:49 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/25 08:09 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock
ci-upstream-linux-next-kasan-gce-root 2022/06/25 06:40 linux-next 2f9cb3d3bd73 a371c43c .config log report info kernel BUG in folio_unlock