[moderation] [block?] BUG: unable to handle kernel NULL pointer dereference in mempool_init_node
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syzbot
May 20, 2024, 8:00:48 PM (13 days ago) May 20
to syzkaller-upst...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 3c999d1ae3c7 Merge tag 'wq-for-6.10' of git://git.kernel.o..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1572cb24980000
kernel config: https://syzkaller.appspot.com/x/.config?x=60e9f916d152f01c
dashboard link: https://syzkaller.appspot.com/bug?extid=2bf6423ebfc4615f2d8e
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: i386
CC: [ax...@kernel.dk linux...@vger.kernel.org linux-...@vger.kernel.org]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-3c999d1a.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f2cbecb7d711/vmlinux-3c999d1a.xz
kernel image: https://storage.googleapis.com/syzbot-assets/f89ef5a44a32/bzImage-3c999d1a.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2bf642...@syzkaller.appspotmail.com
loop3: detected capacity change from 0 to 32768
BUG: kernel NULL pointer dereference, address: 0000000000000011
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 6ae95067 P4D 6ae95067 PUD 1e997067 PMD 0
Oops: Oops: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 PID: 10957 Comm: syz-executor.3 Not tainted 6.9.0-syzkaller-07726-g3c999d1ae3c7 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:___slab_alloc+0x273/0x1810 mm/slub.c:3535
Code: 0b 49 83 7f 28 00 0f 85 5f 07 00 00 4d 89 77 28 49 83 7c 24 10 00 0f 85 c6 05 00 00 4d 8b 7c 24 18 4d 85 ff 0f 84 53 06 00 00 <49> 8b 47 10 83 bd 68 ff ff ff ff 49 89 44 24 18 74 20 49 8b 07 48
RSP: 0018:ffffc90003107200 EFLAGS: 00010002
RAX: 0000000000000000 RBX: 0000000000000202 RCX: ffffffff816bc16e
RDX: 0000000000000001 RSI: ffffffff81e13f31 RDI: 0000000000000000
RBP: ffffc900031072e0 R08: 0000000000000000 R09: fffffbfff283c650
R10: ffffffff941e3287 R11: 0000000000000000 R12: ffffe8ffad021ba0
R13: ffff88806752d400 R14: ffff88801fc62440 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff88802c000000(0063) knlGS:00000000f5f16b40
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000000000011 CR3: 000000005b8a4000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3682
__slab_alloc_node mm/slub.c:3735 [inline]
slab_alloc_node mm/slub.c:3908 [inline]
kmem_cache_alloc+0x2f3/0x330 mm/slub.c:3925
mempool_init_node+0x31e/0x760 mm/mempool.c:217
mempool_init+0x3a/0x50 mm/mempool.c:246
mempool_init_slab_pool include/linux/mempool.h:68 [inline]
bioset_init+0x324/0x7a0 block/bio.c:1785
bch2_fs_fsio_init+0x25/0x50 fs/bcachefs/fs-io.c:1074
bch2_fs_alloc+0x1b9a/0x25c0 fs/bcachefs/super.c:936
bch2_fs_open+0x713/0x10f0 fs/bcachefs/super.c:2084
bch2_mount+0xd41/0x1090 fs/bcachefs/fs.c:1906
legacy_get_tree+0x109/0x220 fs/fs_context.c:662
vfs_get_tree+0x8f/0x380 fs/super.c:1779
do_new_mount fs/namespace.c:3352 [inline]
path_mount+0x6e1/0x1f10 fs/namespace.c:3679
do_mount fs/namespace.c:3692 [inline]
__do_sys_mount fs/namespace.c:3898 [inline]
__se_sys_mount fs/namespace.c:3875 [inline]
__ia32_sys_mount+0x295/0x320 fs/namespace.c:3875
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x75/0x120 arch/x86/entry/common.c:386
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7324579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f5f16400 EFLAGS: 00000292 ORIG_RAX: 0000000000000015
RAX: ffffffffffffffda RBX: 00000000f5f16460 RCX: 0000000020011a40
RDX: 0000000020011a00 RSI: 0000000001200014 RDI: 00000000f5f164a0
RBP: 00000000f5f16460 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
Modules linked in:
CR2: 0000000000000011
---[ end trace 0000000000000000 ]---
RIP: 0010:___slab_alloc+0x273/0x1810 mm/slub.c:3535
Code: 0b 49 83 7f 28 00 0f 85 5f 07 00 00 4d 89 77 28 49 83 7c 24 10 00 0f 85 c6 05 00 00 4d 8b 7c 24 18 4d 85 ff 0f 84 53 06 00 00 <49> 8b 47 10 83 bd 68 ff ff ff ff 49 89 44 24 18 74 20 49 8b 07 48
RSP: 0018:ffffc90003107200 EFLAGS: 00010002
RAX: 0000000000000000 RBX: 0000000000000202 RCX: ffffffff816bc16e
RDX: 0000000000000001 RSI: ffffffff81e13f31 RDI: 0000000000000000
RBP: ffffc900031072e0 R08: 0000000000000000 R09: fffffbfff283c650
R10: ffffffff941e3287 R11: 0000000000000000 R12: ffffe8ffad021ba0
R13: ffff88806752d400 R14: ffff88801fc62440 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff88802c000000(0063) knlGS:00000000f5f16b40
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000000000011 CR3: 000000005b8a4000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 0b 49 83 or -0x7d(%rcx),%ecx
3: 7f 28 jg 0x2d
5: 00 0f add %cl,(%rdi)
7: 85 5f 07 test %ebx,0x7(%rdi)
a: 00 00 add %al,(%rax)
c: 4d 89 77 28 mov %r14,0x28(%r15)
10: 49 83 7c 24 10 00 cmpq $0x0,0x10(%r12)
16: 0f 85 c6 05 00 00 jne 0x5e2
1c: 4d 8b 7c 24 18 mov 0x18(%r12),%r15
21: 4d 85 ff test %r15,%r15
24: 0f 84 53 06 00 00 je 0x67d
* 2a: 49 8b 47 10 mov 0x10(%r15),%rax <-- trapping instruction
2e: 83 bd 68 ff ff ff ff cmpl $0xffffffff,-0x98(%rbp)
35: 49 89 44 24 18 mov %rax,0x18(%r12)
3a: 74 20 je 0x5c
3c: 49 8b 07 mov (%r15),%rax
3f: 48 rex.W
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: 3c999d1ae3c7 Merge tag 'wq-for-6.10' of git://git.kernel.o..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1572cb24980000
kernel config: https://syzkaller.appspot.com/x/.config?x=60e9f916d152f01c
dashboard link: https://syzkaller.appspot.com/bug?extid=2bf6423ebfc4615f2d8e
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: i386
CC: [ax...@kernel.dk linux...@vger.kernel.org linux-...@vger.kernel.org]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-3c999d1a.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f2cbecb7d711/vmlinux-3c999d1a.xz
kernel image: https://storage.googleapis.com/syzbot-assets/f89ef5a44a32/bzImage-3c999d1a.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2bf642...@syzkaller.appspotmail.com
loop3: detected capacity change from 0 to 32768
BUG: kernel NULL pointer dereference, address: 0000000000000011
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 6ae95067 P4D 6ae95067 PUD 1e997067 PMD 0
Oops: Oops: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 PID: 10957 Comm: syz-executor.3 Not tainted 6.9.0-syzkaller-07726-g3c999d1ae3c7 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:___slab_alloc+0x273/0x1810 mm/slub.c:3535
Code: 0b 49 83 7f 28 00 0f 85 5f 07 00 00 4d 89 77 28 49 83 7c 24 10 00 0f 85 c6 05 00 00 4d 8b 7c 24 18 4d 85 ff 0f 84 53 06 00 00 <49> 8b 47 10 83 bd 68 ff ff ff ff 49 89 44 24 18 74 20 49 8b 07 48
RSP: 0018:ffffc90003107200 EFLAGS: 00010002
RAX: 0000000000000000 RBX: 0000000000000202 RCX: ffffffff816bc16e
RDX: 0000000000000001 RSI: ffffffff81e13f31 RDI: 0000000000000000
RBP: ffffc900031072e0 R08: 0000000000000000 R09: fffffbfff283c650
R10: ffffffff941e3287 R11: 0000000000000000 R12: ffffe8ffad021ba0
R13: ffff88806752d400 R14: ffff88801fc62440 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff88802c000000(0063) knlGS:00000000f5f16b40
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000000000011 CR3: 000000005b8a4000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3682
__slab_alloc_node mm/slub.c:3735 [inline]
slab_alloc_node mm/slub.c:3908 [inline]
kmem_cache_alloc+0x2f3/0x330 mm/slub.c:3925
mempool_init_node+0x31e/0x760 mm/mempool.c:217
mempool_init+0x3a/0x50 mm/mempool.c:246
mempool_init_slab_pool include/linux/mempool.h:68 [inline]
bioset_init+0x324/0x7a0 block/bio.c:1785
bch2_fs_fsio_init+0x25/0x50 fs/bcachefs/fs-io.c:1074
bch2_fs_alloc+0x1b9a/0x25c0 fs/bcachefs/super.c:936
bch2_fs_open+0x713/0x10f0 fs/bcachefs/super.c:2084
bch2_mount+0xd41/0x1090 fs/bcachefs/fs.c:1906
legacy_get_tree+0x109/0x220 fs/fs_context.c:662
vfs_get_tree+0x8f/0x380 fs/super.c:1779
do_new_mount fs/namespace.c:3352 [inline]
path_mount+0x6e1/0x1f10 fs/namespace.c:3679
do_mount fs/namespace.c:3692 [inline]
__do_sys_mount fs/namespace.c:3898 [inline]
__se_sys_mount fs/namespace.c:3875 [inline]
__ia32_sys_mount+0x295/0x320 fs/namespace.c:3875
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x75/0x120 arch/x86/entry/common.c:386
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7324579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f5f16400 EFLAGS: 00000292 ORIG_RAX: 0000000000000015
RAX: ffffffffffffffda RBX: 00000000f5f16460 RCX: 0000000020011a40
RDX: 0000000020011a00 RSI: 0000000001200014 RDI: 00000000f5f164a0
RBP: 00000000f5f16460 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
Modules linked in:
CR2: 0000000000000011
---[ end trace 0000000000000000 ]---
RIP: 0010:___slab_alloc+0x273/0x1810 mm/slub.c:3535
Code: 0b 49 83 7f 28 00 0f 85 5f 07 00 00 4d 89 77 28 49 83 7c 24 10 00 0f 85 c6 05 00 00 4d 8b 7c 24 18 4d 85 ff 0f 84 53 06 00 00 <49> 8b 47 10 83 bd 68 ff ff ff ff 49 89 44 24 18 74 20 49 8b 07 48
RSP: 0018:ffffc90003107200 EFLAGS: 00010002
RAX: 0000000000000000 RBX: 0000000000000202 RCX: ffffffff816bc16e
RDX: 0000000000000001 RSI: ffffffff81e13f31 RDI: 0000000000000000
RBP: ffffc900031072e0 R08: 0000000000000000 R09: fffffbfff283c650
R10: ffffffff941e3287 R11: 0000000000000000 R12: ffffe8ffad021ba0
R13: ffff88806752d400 R14: ffff88801fc62440 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff88802c000000(0063) knlGS:00000000f5f16b40
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000000000011 CR3: 000000005b8a4000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 0b 49 83 or -0x7d(%rcx),%ecx
3: 7f 28 jg 0x2d
5: 00 0f add %cl,(%rdi)
7: 85 5f 07 test %ebx,0x7(%rdi)
a: 00 00 add %al,(%rax)
c: 4d 89 77 28 mov %r14,0x28(%r15)
10: 49 83 7c 24 10 00 cmpq $0x0,0x10(%r12)
16: 0f 85 c6 05 00 00 jne 0x5e2
1c: 4d 8b 7c 24 18 mov 0x18(%r12),%r15
21: 4d 85 ff test %r15,%r15
24: 0f 84 53 06 00 00 je 0x67d
* 2a: 49 8b 47 10 mov 0x10(%r15),%rax <-- trapping instruction
2e: 83 bd 68 ff ff ff ff cmpl $0xffffffff,-0x98(%rbp)
35: 49 89 44 24 18 mov %rax,0x18(%r12)
3a: 74 20 je 0x5c
3c: 49 8b 07 mov (%r15),%rax
3f: 48 rex.W
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
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