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general protection fault in btrfs_root_node

Status: upstream: reported C repro on 2024/09/03 16:42
Subsystems: btrfs
[Documentation on labels]
Reported-by: syzbot+9c3e0cdfbfe351b0bc0e@syzkaller.appspotmail.com
First crash: 82d, last: 1d09h
Cause bisection: introduced by (bisect log) :
commit 42437a6386ffeaaf200731e73d723ea491f3fe7d
Author: Josef Bacik <josef@toxicpanda.com>
Date: Fri Oct 16 15:29:18 2020 +0000

  btrfs: introduce mount option rescue=ignorebadroots

Crash: BUG: unable to handle kernel NULL pointer dereference in btrfs_root_node (log)
Repro: C syz .config
  
▶ ▼ Discussions (2)
Title Replies (including bot) Last reply
[syzbot] [btrfs?] general protection fault in btrfs_root_node 0 (5) 2024/11/12 10:47
[PATCH] btrfs: Added null check to extent_root variable 6 (6) 2024/09/04 21:31
▶ ▼ Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 BUG: unable to handle kernel paging request in btrfs_root_node origin:upstream C 2 24d 24d 0/3 upstream: reported C repro on 2024/10/27 14:03
linux-5.15 KASAN: null-ptr-deref Write in btrfs_root_node 1 577d 577d 0/3 auto-obsoleted due to no activity on 2023/08/22 05:04
linux-5.15 KASAN: null-ptr-deref Write in btrfs_root_node (2) origin:lts-only C done 10 17d 430d 0/3 upstream: reported C repro on 2023/09/18 04:34
▶ ▼ Last patch testing requests (4)
Created Duration User Patch Repo Result
2024/09/16 03:11 14m retest repro upstream report log
2024/09/04 02:12 19m ghanshyam1898@gmail.com patch upstream OK log
2024/09/04 01:43 0m ghanshyam1898@gmail.com patch upstream error
2024/09/04 01:38 0m ghanshyam1898@gmail.com patch upstream error

Sample crash report:
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
CPU: 0 UID: 0 PID: 5831 Comm: syz-executor118 Not tainted 6.12.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
RIP: 0010:btrfs_root_node+0x86/0x3b0 fs/btrfs/ctree.c:260
Code: e0 bb c5 fd 48 83 c4 08 e8 c7 63 14 08 89 c3 31 ff 89 c6 e8 dc 52 ea fd 85 db 74 17 e8 e3 3b d0 fd 84 c0 74 1c e8 8a 4e ea fd <43> 80 3c 3c 00 75 4b eb 51 e8 7c 4e ea fd 43 80 3c 3c 00 75 3d eb
RSP: 0018:ffffc90003df76c0 EFLAGS: 00010293
RAX: ffffffff83aa8b26 RBX: 0000000000000001 RCX: ffff888024339e00
RDX: 0000000000000000 RSI: ffffffff8c603640 RDI: ffffffff8c603600
RBP: ffffc90003df78b0 R08: ffffffff83aa8b14 R09: 1ffffffff2853100
R10: dffffc0000000000 R11: fffffbfff2853101 R12: 0000000000000003
R13: dffffc0000000000 R14: 0000000000000018 R15: dffffc0000000000
FS:  000055556ec02380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055fa03db78a0 CR3: 000000007a8b0000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 btrfs_read_lock_root_node+0x27/0xd0 fs/btrfs/locking.c:279
 btrfs_build_ref_tree+0x112/0x16f0 fs/btrfs/ref-verify.c:1005
 open_ctree+0x1fd0/0x2a50 fs/btrfs/disk-io.c:3523
 btrfs_fill_super fs/btrfs/super.c:974 [inline]
 btrfs_get_tree_super fs/btrfs/super.c:1896 [inline]
 btrfs_get_tree+0x1276/0x1a10 fs/btrfs/super.c:2107
 vfs_get_tree+0x90/0x2b0 fs/super.c:1814
 fc_mount+0x1b/0xb0 fs/namespace.c:1231
 btrfs_get_tree_subvol fs/btrfs/super.c:2070 [inline]
 btrfs_get_tree+0x65b/0x1a10 fs/btrfs/super.c:2108
 vfs_get_tree+0x90/0x2b0 fs/super.c:1814
 do_new_mount+0x2be/0xb40 fs/namespace.c:3507
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4057 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4034
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7feff06b7a4a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007ffc4d92d5a8 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffc4d92d5b0 RCX: 00007feff06b7a4a
RDX: 0000000020000080 RSI: 0000000020000000 RDI: 00007ffc4d92d5b0
RBP: 0000000000000004 R08: 00007ffc4d92d5f0 R09: 00000000000055c5
R10: 000000000001c005 R11: 0000000000000282 R12: 00007ffc4d92d5f0
R13: 0000000000000003 R14: 0000000001000000 R15: 0000000000000001
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:btrfs_root_node+0x86/0x3b0 fs/btrfs/ctree.c:260
Code: e0 bb c5 fd 48 83 c4 08 e8 c7 63 14 08 89 c3 31 ff 89 c6 e8 dc 52 ea fd 85 db 74 17 e8 e3 3b d0 fd 84 c0 74 1c e8 8a 4e ea fd <43> 80 3c 3c 00 75 4b eb 51 e8 7c 4e ea fd 43 80 3c 3c 00 75 3d eb
RSP: 0018:ffffc90003df76c0 EFLAGS: 00010293
RAX: ffffffff83aa8b26 RBX: 0000000000000001 RCX: ffff888024339e00
RDX: 0000000000000000 RSI: ffffffff8c603640 RDI: ffffffff8c603600
RBP: ffffc90003df78b0 R08: ffffffff83aa8b14 R09: 1ffffffff2853100
R10: dffffc0000000000 R11: fffffbfff2853101 R12: 0000000000000003
R13: dffffc0000000000 R14: 0000000000000018 R15: dffffc0000000000
FS:  000055556ec02380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055fa03db78a0 CR3: 000000007a8b0000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 3 bytes skipped:
   0:	fd                   	std
   1:	48 83 c4 08          	add    $0x8,%rsp
   5:	e8 c7 63 14 08       	call   0x81463d1
   a:	89 c3                	mov    %eax,%ebx
   c:	31 ff                	xor    %edi,%edi
   e:	89 c6                	mov    %eax,%esi
  10:	e8 dc 52 ea fd       	call   0xfdea52f1
  15:	85 db                	test   %ebx,%ebx
  17:	74 17                	je     0x30
  19:	e8 e3 3b d0 fd       	call   0xfdd03c01
  1e:	84 c0                	test   %al,%al
  20:	74 1c                	je     0x3e
  22:	e8 8a 4e ea fd       	call   0xfdea4eb1
* 27:	43 80 3c 3c 00       	cmpb   $0x0,(%r12,%r15,1) <-- trapping instruction
  2c:	75 4b                	jne    0x79
  2e:	eb 51                	jmp    0x81
  30:	e8 7c 4e ea fd       	call   0xfdea4eb1
  35:	43 80 3c 3c 00       	cmpb   $0x0,(%r12,%r15,1)
  3a:	75 3d                	jne    0x79
  3c:	eb                   	.byte 0xeb

Crashes (67):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/11/11 09:16 upstream 2d5404caa8c7 6b856513 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs general protection fault in btrfs_root_node
2024/08/30 16:47 upstream 20371ba12063 db150e23 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/11/03 17:40 upstream 3e5e6c9900c3 f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in btrfs_root_node
2024/11/19 21:05 upstream 158f238aa69d 7d02db5a .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/11/18 03:56 upstream f66d6acccbc0 cfe3a04a .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/11/17 13:10 upstream 4a5df3796467 cfe3a04a .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/11/17 01:05 upstream e8bdb3c8be08 cfe3a04a .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/11/16 19:15 upstream e8bdb3c8be08 cfe3a04a .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/11/12 06:01 upstream 2d5404caa8c7 75bb1b32 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/11/12 02:30 upstream 2d5404caa8c7 75bb1b32 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/11/11 13:53 upstream 2d5404caa8c7 0c4b1325 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/11/11 11:23 upstream 2d5404caa8c7 0c4b1325 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/11/10 07:46 upstream de2f378f2b77 6b856513 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/11/10 00:54 upstream da4373fbcf00 6b856513 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/11/09 07:25 upstream f1dce1f09380 6b856513 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/11/08 23:12 upstream f1dce1f09380 d40c056e .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/11/06 10:44 upstream 2e1b3cc9d7f7 3a465482 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/11/05 14:54 upstream 2e1b3cc9d7f7 da38b4c9 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/11/04 19:54 upstream 59b723cd2adb 0754ea12 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/11/03 11:45 upstream 3e5e6c9900c3 f00eed24 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/11/02 18:28 upstream 11066801dd4b f00eed24 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/11/02 16:02 upstream 11066801dd4b f00eed24 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/11/02 10:35 upstream 11066801dd4b f00eed24 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/10/31 06:02 upstream 4236f913808c fb888278 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/10/30 06:54 upstream c1e939a21eb1 66aeb999 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/10/28 18:22 upstream 819837584309 9efb3cc7 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/10/27 17:50 upstream 850925a8133c 65e8686b .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/10/27 07:45 upstream 850925a8133c 65e8686b .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/10/27 06:55 upstream 850925a8133c 65e8686b .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/10/26 18:18 upstream 850925a8133c 65e8686b .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/10/25 20:37 upstream ae90f6a6170d 2a61f980 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/10/24 06:17 upstream c2ee9f594da8 15fa2979 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/10/22 15:10 upstream c2ee9f594da8 a573a9f4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/10/21 23:13 upstream 42f7652d3eb5 14517542 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/10/21 21:29 upstream 42f7652d3eb5 14517542 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/10/19 08:26 upstream b04ae0f45168 cd6fc0a3 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/10/18 19:22 upstream 4d939780b705 0270e729 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/10/14 00:05 upstream 36c254515dc6 084d8178 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/10/13 21:27 upstream 36c254515dc6 084d8178 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/10/13 08:29 upstream 7234e2ea0edd 084d8178 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/09/30 22:25 upstream 9852d85ec9d4 179f4029 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/09/30 22:16 upstream 9852d85ec9d4 179f4029 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/09/30 19:59 upstream 9852d85ec9d4 179f4029 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/09/29 15:15 upstream 3efc57369a0c ba29ff75 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/09/29 14:28 upstream 3efc57369a0c ba29ff75 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/09/28 21:06 upstream ad46e8f95e93 ba29ff75 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/09/28 20:54 upstream ad46e8f95e93 ba29ff75 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/09/25 17:31 upstream 684a64bf32b6 0b45cac3 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/09/24 20:25 upstream abf2050f51fd 5643e0e9 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/09/23 06:08 upstream af9c191ac2a0 6f888b75 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/09/22 13:47 upstream 88264981f208 6f888b75 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/09/21 10:25 upstream 1868f9d0260e 6f888b75 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/09/19 04:55 upstream 4a39ac5b7d62 c673ca06 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/09/19 00:02 upstream 4a39ac5b7d62 c673ca06 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/09/02 03:10 upstream 431c1646e1f8 1eda0d14 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/08/30 16:32 upstream 20371ba12063 db150e23 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/11/16 13:56 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 887407160d72 cfe3a04a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in btrfs_root_node
2024/11/14 09:23 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 8e9a54d7181b a8c99394 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in btrfs_root_node
2024/11/14 00:30 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 8e9a54d7181b a8c99394 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in btrfs_root_node
2024/11/10 04:07 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 563047e691f2 6b856513 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in btrfs_root_node
2024/11/09 19:04 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 563047e691f2 6b856513 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in btrfs_root_node
2024/11/08 03:16 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 9bf801c386f9 c069283c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in btrfs_root_node
2024/10/11 20:55 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 2d8bce6e34be cd942402 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in btrfs_root_node
2024/09/24 00:32 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 5f5673607153 89298aad .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in btrfs_root_node
* Struck through repros no longer work on HEAD.