Hello,
syzbot found the following issue on:
HEAD commit: 4e1bc8d8e8ae Merge branch 'android13-5.10' into branch 'an..
git tree: android13-5.10-lts
console+strace:
https://syzkaller.appspot.com/x/log.txt?x=14bc25a1180000
kernel config:
https://syzkaller.appspot.com/x/.config?x=1a6e39f6bdc97aed
dashboard link:
https://syzkaller.appspot.com/bug?extid=1f38b4bccc03c336b205
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:
https://syzkaller.appspot.com/x/repro.syz?x=11512125180000
C reproducer:
https://syzkaller.appspot.com/x/repro.c?x=1700bd6b180000
Downloadable assets:
disk image:
https://storage.googleapis.com/syzbot-assets/cce4facb9f9d/disk-4e1bc8d8.raw.xz
vmlinux:
https://storage.googleapis.com/syzbot-assets/b73ea3cf695a/vmlinux-4e1bc8d8.xz
kernel image:
https://storage.googleapis.com/syzbot-assets/8d25aa75f46d/bzImage-4e1bc8d8.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by:
syzbot+1f38b4...@syzkaller.appspotmail.com
R10: 00000000ffffffff R11: 0000000000000202 R12: 00007fff6f146170
R13: 0000555556f5a800 R14: 431bde82d7b634db R15: 00007fff6f147200
---[ end trace b57c4085c9099394 ]---
==================================================================
BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
BUG: KASAN: null-ptr-deref in atomic_inc_return include/asm-generic/atomic-instrumented.h:250 [inline]
BUG: KASAN: null-ptr-deref in ihold+0x20/0x60 fs/inode.c:423
Write of size 4 at addr 0000000000000170 by task syz-executor170/287
CPU: 1 PID: 287 Comm: syz-executor170 Tainted: G W 5.10.209-syzkaller-00002-g4e1bc8d8e8ae #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118
__kasan_report mm/kasan/report.c:439 [inline]
kasan_report+0x167/0x1c0 mm/kasan/report.c:452
kasan_check_range+0x293/0x2a0 mm/kasan/generic.c:189
__kasan_check_write+0x14/0x20 mm/kasan/shadow.c:37
instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
atomic_inc_return include/asm-generic/atomic-instrumented.h:250 [inline]
ihold+0x20/0x60 fs/inode.c:423
d_delete_notify include/linux/fsnotify.h:258 [inline]
vfs_rmdir+0x200/0x3f0 fs/namei.c:3871
incfs_kill_sb+0x108/0x220 fs/incfs/vfs.c:1945
deactivate_locked_super+0xad/0x110 fs/super.c:335
deactivate_super+0xbe/0xf0 fs/super.c:366
cleanup_mnt+0x45c/0x510 fs/namespace.c:1118
__cleanup_mnt+0x19/0x20 fs/namespace.c:1125
task_work_run+0x129/0x190 kernel/task_work.c:164
ptrace_notify+0x29e/0x350 kernel/signal.c:2277
ptrace_report_syscall include/linux/tracehook.h:66 [inline]
tracehook_report_syscall_exit include/linux/tracehook.h:129 [inline]
arch_syscall_exit_tracehook include/linux/entry-common.h:285 [inline]
syscall_exit_work kernel/entry/common.c:239 [inline]
syscall_exit_to_user_mode_prepare kernel/entry/common.c:266 [inline]
syscall_exit_to_user_mode+0x120/0x1d0 kernel/entry/common.c:272
do_syscall_64+0x40/0x70 arch/x86/entry/common.c:56
entry_SYSCALL_64_after_hwframe+0x61/0xc6
RIP: 0033:0x7fd51d668d07
Code: 07 00 48 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007fff6f144fc8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fd51d668d07
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff6f145080
RBP: 00007fff6f145080 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000202 R12: 00007fff6f146170
R13: 0000555556f5a800 R14: 431bde82d7b634db R15: 00007fff6f147200
==================================================================
BUG: kernel NULL pointer dereference, address: 0000000000000170
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 0 P4D 0
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 287 Comm: syz-executor170 Tainted: G B W 5.10.209-syzkaller-00002-g4e1bc8d8e8ae #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:arch_atomic_inc_return include/linux/atomic-arch-fallback.h:286 [inline]
RIP: 0010:atomic_inc_return include/asm-generic/atomic-instrumented.h:251 [inline]
RIP: 0010:ihold+0x25/0x60 fs/inode.c:423
Code: 00 00 00 00 00 55 48 89 e5 41 56 53 49 89 fe e8 b1 56 b3 ff 49 8d be 70 01 00 00 be 04 00 00 00 e8 00 d4 f0 ff bb 01 00 00 00 <f0> 41 0f c1 9e 70 01 00 00 ff c3 bf 02 00 00 00 89 de e8 34 5a b3
RSP: 0018:ffffc90000af7c28 EFLAGS: 00010246
RAX: ffff88811e636200 RBX: 0000000000000001 RCX: ffff88811e6362c0
RDX: 0000000000000000 RSI: 0000000000000282 RDI: 00000000ffffffff
RBP: ffffc90000af7c38 R08: ffffffff813e2edb R09: 0000000000000003
R10: fffffbfff0e10248 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff88811c0d6aa0 R14: 0000000000000000 R15: 0000000000000000
FS: 0000555556f51480(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000170 CR3: 000000011e81e000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
d_delete_notify include/linux/fsnotify.h:258 [inline]
vfs_rmdir+0x200/0x3f0 fs/namei.c:3871
incfs_kill_sb+0x108/0x220 fs/incfs/vfs.c:1945
deactivate_locked_super+0xad/0x110 fs/super.c:335
deactivate_super+0xbe/0xf0 fs/super.c:366
cleanup_mnt+0x45c/0x510 fs/namespace.c:1118
__cleanup_mnt+0x19/0x20 fs/namespace.c:1125
task_work_run+0x129/0x190 kernel/task_work.c:164
ptrace_notify+0x29e/0x350 kernel/signal.c:2277
ptrace_report_syscall include/linux/tracehook.h:66 [inline]
tracehook_report_syscall_exit include/linux/tracehook.h:129 [inline]
arch_syscall_exit_tracehook include/linux/entry-common.h:285 [inline]
syscall_exit_work kernel/entry/common.c:239 [inline]
syscall_exit_to_user_mode_prepare kernel/entry/common.c:266 [inline]
syscall_exit_to_user_mode+0x120/0x1d0 kernel/entry/common.c:272
do_syscall_64+0x40/0x70 arch/x86/entry/common.c:56
entry_SYSCALL_64_after_hwframe+0x61/0xc6
RIP: 0033:0x7fd51d668d07
Code: 07 00 48 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007fff6f144fc8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fd51d668d07
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff6f145080
RBP: 00007fff6f145080 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000202 R12: 00007fff6f146170
R13: 0000555556f5a800 R14: 431bde82d7b634db R15: 00007fff6f147200
Modules linked in:
CR2: 0000000000000170
---[ end trace b57c4085c9099395 ]---
RIP: 0010:arch_atomic_inc_return include/linux/atomic-arch-fallback.h:286 [inline]
RIP: 0010:atomic_inc_return include/asm-generic/atomic-instrumented.h:251 [inline]
RIP: 0010:ihold+0x25/0x60 fs/inode.c:423
Code: 00 00 00 00 00 55 48 89 e5 41 56 53 49 89 fe e8 b1 56 b3 ff 49 8d be 70 01 00 00 be 04 00 00 00 e8 00 d4 f0 ff bb 01 00 00 00 <f0> 41 0f c1 9e 70 01 00 00 ff c3 bf 02 00 00 00 89 de e8 34 5a b3
RSP: 0018:ffffc90000af7c28 EFLAGS: 00010246
RAX: ffff88811e636200 RBX: 0000000000000001 RCX: ffff88811e6362c0
RDX: 0000000000000000 RSI: 0000000000000282 RDI: 00000000ffffffff
RBP: ffffc90000af7c38 R08: ffffffff813e2edb R09: 0000000000000003
R10: fffffbfff0e10248 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff88811c0d6aa0 R14: 0000000000000000 R15: 0000000000000000
FS: 0000555556f51480(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000170 CR3: 000000011e81e000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 00 00 add %al,(%rax)
2: 00 00 add %al,(%rax)
4: 00 55 48 add %dl,0x48(%rbp)
7: 89 e5 mov %esp,%ebp
9: 41 56 push %r14
b: 53 push %rbx
c: 49 89 fe mov %rdi,%r14
f: e8 b1 56 b3 ff call 0xffb356c5
14: 49 8d be 70 01 00 00 lea 0x170(%r14),%rdi
1b: be 04 00 00 00 mov $0x4,%esi
20: e8 00 d4 f0 ff call 0xfff0d425
25: bb 01 00 00 00 mov $0x1,%ebx
* 2a: f0 41 0f c1 9e 70 01 lock xadd %ebx,0x170(%r14) <-- trapping instruction
31: 00 00
33: ff c3 inc %ebx
35: bf 02 00 00 00 mov $0x2,%edi
3a: 89 de mov %ebx,%esi
3c: e8 .byte 0xe8
3d: 34 5a xor $0x5a,%al
3f: b3 .byte 0xb3
---
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