syzbot


BUG: unable to handle kernel NULL pointer dereference in gfs2_rindex_update

Status: fixed on 2024/01/30 15:47
Subsystems: gfs2
[Documentation on labels]
Reported-by: syzbot+2b32df23ff6b5b307565@syzkaller.appspotmail.com
Fix commit: 6f861765464f fs: Block writes to mounted block devices
First crash: 518d, last: 159d
Cause bisection: failed (error log, bisect log)
  
Fix bisection: fixed by (bisect log) :
commit 6f861765464f43a71462d52026fbddfc858239a5
Author: Jan Kara <jack@suse.cz>
Date: Wed Nov 1 17:43:10 2023 +0000

  fs: Block writes to mounted block devices

  
Discussions (5)
Title Replies (including bot) Last reply
[syzbot] [gfs2?] BUG: unable to handle kernel NULL pointer dereference in gfs2_rindex_update 2 (4) 2024/01/16 15:57
[syzbot] Monthly gfs2 report (Dec 2023) 0 (1) 2023/12/07 09:56
[syzbot] Monthly gfs2 report (Nov 2023) 0 (1) 2023/11/06 23:07
[syzbot] Monthly gfs2 report (Sep 2023) 0 (1) 2023/09/04 08:33
[syzbot] Monthly gfs2 report (Aug 2023) 0 (1) 2023/08/02 11:18
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream general protection fault in gfs2_rindex_update gfs2 C done error 3 75d 105d 0/26 upstream: reported C repro on 2024/02/08 09:52
Last patch testing requests (9)
Created Duration User Patch Repo Result
2024/01/12 23:06 18m retest repro upstream OK log
2023/12/16 05:35 21m retest repro upstream report log
2023/12/02 01:59 15m retest repro upstream report log
2023/11/17 23:54 22m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci report log
2023/11/03 21:20 12m retest repro upstream report log
2023/10/07 01:35 14m retest repro upstream report log
2023/09/23 00:16 21m retest repro upstream report log
2023/09/08 22:51 22m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci report log
2023/08/25 18:43 22m retest repro upstream report log
Fix bisection attempts (7)
Created Duration User Patch Repo Result
2024/01/16 11:50 4h03m bisect fix upstream job log (1)
2023/07/19 11:44 1h17m bisect fix upstream job log (0) log
2023/06/02 15:42 44m bisect fix upstream job log (0) log
2023/05/03 10:20 58m bisect fix upstream job log (0) log
2023/04/02 12:40 1h05m bisect fix upstream job log (0) log
2023/03/03 11:58 41m bisect fix upstream job log (0) log
2023/02/01 08:57 38m bisect fix upstream job log (0) log

Sample crash report:
loop0: detected capacity change from 0 to 32768
gfs2: fsid=syz:syz: Trying to join cluster "lock_nolock", "syz:syz"
gfs2: fsid=syz:syz: Now mounting FS (format 1801)...
gfs2: fsid=syz:syz.0: journal 0 mapped with 3 extents in 0ms
Unable to handle kernel NULL pointer dereference at virtual address 00000000000004b8
Mem abort info:
  ESR = 0x0000000096000006
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x06: level 2 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000006
  CM = 0, WnR = 0
user pgtable: 4k pages, 48-bit VAs, pgdp=000000010d0e4000
[00000000000004b8] pgd=080000010d0ef003, p4d=080000010d0ef003, pud=080000010c843003, pmd=0000000000000000
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 3073 Comm: syz-executor647 Not tainted 6.1.0-rc8-syzkaller-33330-ga5541c0811a0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : gfs2_rindex_update+0x4c/0x21c fs/gfs2/rgrp.c:1037
lr : gfs2_rindex_update+0x3c/0x21c fs/gfs2/rgrp.c:1035
sp : ffff800012f13610
x29: ffff800012f13650 x28: 0000000000000000 x27: 0000000000000000
x26: ffff0000ca97a580 x25: ffff0000cb5ee000 x24: ffff0000cb5ee174
x23: 0000000000000000 x22: ffff80000925c6b0 x21: ffff800012f13850
x20: ffff0000cb5ee000 x19: 0000000000000000 x18: ffff800012f132d0
x17: ffff80000dda8198 x16: ffff80000dbe6158 x15: ffff0000c99bcec0
x14: 0000000000000000 x13: 00000000ffffffff x12: ffff0000c99bcec0
x11: ff808000092a1b7c x10: 0000000000000000 x9 : ffff8000092a1b7c
x8 : ffff0000c99bcec0 x7 : ffff80000846001c x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000002
x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 gfs2_rindex_update+0x4c/0x21c fs/gfs2/rgrp.c:1038
 punch_hole+0x578/0x18b8 fs/gfs2/bmap.c:1796
 gfs2_truncatei_resume+0x28/0x68 fs/gfs2/bmap.c:2154
 inode_go_held+0xb8/0xe0 fs/gfs2/glops.c:513
 gfs2_instantiate+0xf0/0x208 fs/gfs2/glock.c:529
 gfs2_glock_holder_ready fs/gfs2/glock.c:1326 [inline]
 gfs2_glock_wait+0x10c/0x164 fs/gfs2/glock.c:1346
 gfs2_glock_nq+0x104/0x220 fs/gfs2/glock.c:1596
 gfs2_glock_nq_init fs/gfs2/glock.h:264 [inline]
 init_statfs fs/gfs2/ops_fstype.c:696 [inline]
 init_journal+0x7a8/0xcbc fs/gfs2/ops_fstype.c:820
 init_inodes+0x74/0x184 fs/gfs2/ops_fstype.c:889
 gfs2_fill_super+0x630/0x874 fs/gfs2/ops_fstype.c:1247
 get_tree_bdev+0x1e8/0x2a0 fs/super.c:1324
 gfs2_get_tree+0x30/0xc0 fs/gfs2/ops_fstype.c:1330
 vfs_get_tree+0x40/0x140 fs/super.c:1531
 do_new_mount+0x1dc/0x4e4 fs/namespace.c:3040
 path_mount+0x358/0x890 fs/namespace.c:3370
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount fs/namespace.c:3568 [inline]
 __arm64_sys_mount+0x2c4/0x3c4 fs/namespace.c:3568
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall arch/arm64/kernel/syscall.c:52 [inline]
 el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x48/0x140 arch/arm64/kernel/syscall.c:197
 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:584
Code: f943a293 b947c697 2a1f03e0 a902ffff (f9425e75) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	f943a293 	ldr	x19, [x20, #1856]
   4:	b947c697 	ldr	w23, [x20, #1988]
   8:	2a1f03e0 	mov	w0, wzr
   c:	a902ffff 	stp	xzr, xzr, [sp, #40]
* 10:	f9425e75 	ldr	x21, [x19, #1208] <-- trapping instruction

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/12/22 14:43 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a5541c0811a0 c692fab1 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-gce-arm64 BUG: unable to handle kernel NULL pointer dereference in gfs2_rindex_update
2023/08/04 08:23 upstream 7bafbd4027ae 74621247 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-gce-selinux-root general protection fault in gfs2_rindex_update
2023/06/14 14:41 upstream b6dad5178cea d2ee9228 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-gce-smack-root general protection fault in gfs2_rindex_update
2022/12/22 19:41 upstream 0a924817d2ed 9da18ae8 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs general protection fault in gfs2_rindex_update
* Struck through repros no longer work on HEAD.