[v5.15] BUG: unable to handle kernel paging request in preempt_schedule_irq
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syzbot
Apr 28, 2025, 8:49:22 AM4/28/25
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: f7347f400572 Linux 5.15.180
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=169670d4580000
kernel config: https://syzkaller.appspot.com/x/.config?x=e0a09dd23d715b59
dashboard link: https://syzkaller.appspot.com/bug?extid=20d9f172fbffe19fe12f
compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f174a25d1f90/disk-f7347f40.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2b5ffc4e5dc3/vmlinux-f7347f40.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b48f40123eb9/bzImage-f7347f40.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+20d9f1...@syzkaller.appspotmail.com
BUG: unable to handle page fault for address: ffffed11042dc76f
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 23ffef067 P4D 23ffef067 PUD 0
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 8669 Comm: syz.4.1095 Not tainted 5.15.180-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:constant_test_bit arch/x86/include/asm/bitops.h:207 [inline]
RIP: 0010:test_bit include/asm-generic/bitops/instrumented-non-atomic.h:135 [inline]
RIP: 0010:test_ti_thread_flag include/linux/thread_info.h:118 [inline]
RIP: 0010:need_resched include/linux/sched.h:2111 [inline]
RIP: 0010:preempt_schedule_irq+0xf6/0x150 kernel/sched/core.c:6783
Code: 10 b6 d4 f7 bf 01 00 00 00 e8 96 32 a8 f7 65 48 8b 1d 2e 46 59 76 48 89 df be 08 00 00 00 e8 f1 02 14 f8 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 91 48 89 df e8 4b 01 14 f8 eb 87 48 c7 04 24 0e
RSP: 0018:ffffc900031bf9e0 EFLAGS: 00010802
RAX: 1ffff110042dc770 RBX: ffff8880216e3b80 RCX: ffffffff89a9299f
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8880216e3b80
RBP: ffffc900031bfa90 R08: dffffc0000000000 R09: ffffed10042dc771
R10: ffffed10042dc771 R11: 1ffff110042dc770 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc00ffffffff R15: 1ffff92000637f3c
FS: 00007fee3e0126c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffed11042dc76f CR3: 000000001a1f8000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
irqentry_exit+0x63/0x70 kernel/entry/common.c:432
asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:681
RIP: 0010:memcpy_erms+0x6/0x10 arch/x86/lib/memcpy_64.S:55
Code: fe ff ff 00 eb 1e 0f 1f 00 48 89 f8 48 89 d1 48 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 c3 90 90 90 90 90 90 48 89 f8 48 89 d1 <f3> a4 c3 90 90 90 90 90 90 90 48 89 f8 48 83 fa 20 72 7e 40 38 fe
RSP: 0018:ffffc900031bfb58 EFLAGS: 00010202
RAX: ffff888075948000 RBX: 0000000000000000 RCX: 0000000000000180
RDX: 0000000000000a00 RSI: ffff88805e751880 RDI: ffff888075948880
RBP: ffffc900031bfd28 R08: dffffc0000000000 R09: ffffed100eb29140
R10: 0000000000000000 R11: 0000000000000140 R12: ffff8880227b6000
R13: ffffea000179d440 R14: ffff88801b6881f0 R15: 0000000000000000
ntfs_fill_super+0x302e/0x3c10 fs/ntfs3/super.c:1153
get_tree_bdev+0x3f1/0x610 fs/super.c:1325
vfs_get_tree+0x88/0x270 fs/super.c:1530
do_new_mount+0x24a/0xa40 fs/namespace.c:3012
do_mount fs/namespace.c:3355 [inline]
__do_sys_mount fs/namespace.c:3563 [inline]
__se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3540
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fee401ac10a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fee3e011e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fee3e011ef0 RCX: 00007fee401ac10a
RDX: 0000200000000000 RSI: 0000200000000280 RDI: 00007fee3e011eb0
RBP: 0000200000000000 R08: 00007fee3e011ef0 R09: 0000000002010c14
R10: 0000000002010c14 R11: 0000000000000246 R12: 0000200000000280
R13: 00007fee3e011eb0 R14: 000000000001f75b R15: 00002000000000c0
</TASK>
Modules linked in:
CR2: ffffed11042dc76f
---[ end trace daaf2d8927499dbf ]---
RIP: 0010:constant_test_bit arch/x86/include/asm/bitops.h:207 [inline]
RIP: 0010:test_bit include/asm-generic/bitops/instrumented-non-atomic.h:135 [inline]
RIP: 0010:test_ti_thread_flag include/linux/thread_info.h:118 [inline]
RIP: 0010:need_resched include/linux/sched.h:2111 [inline]
RIP: 0010:preempt_schedule_irq+0xf6/0x150 kernel/sched/core.c:6783
Code: 10 b6 d4 f7 bf 01 00 00 00 e8 96 32 a8 f7 65 48 8b 1d 2e 46 59 76 48 89 df be 08 00 00 00 e8 f1 02 14 f8 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 91 48 89 df e8 4b 01 14 f8 eb 87 48 c7 04 24 0e
RSP: 0018:ffffc900031bf9e0 EFLAGS: 00010802
RAX: 1ffff110042dc770 RBX: ffff8880216e3b80 RCX: ffffffff89a9299f
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8880216e3b80
RBP: ffffc900031bfa90 R08: dffffc0000000000 R09: ffffed10042dc771
R10: ffffed10042dc771 R11: 1ffff110042dc770 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc00ffffffff R15: 1ffff92000637f3c
FS: 00007fee3e0126c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffed11042dc76f CR3: 000000001a1f8000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 10 b6 d4 f7 bf 01 adc %dh,0x1bff7d4(%rsi)
6: 00 00 add %al,(%rax)
8: 00 e8 add %ch,%al
a: 96 xchg %eax,%esi
b: 32 a8 f7 65 48 8b xor -0x74b79a09(%rax),%ch
11: 1d 2e 46 59 76 sbb $0x7659462e,%eax
16: 48 89 df mov %rbx,%rdi
19: be 08 00 00 00 mov $0x8,%esi
1e: e8 f1 02 14 f8 call 0xf8140314
23: 48 89 d8 mov %rbx,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) <-- trapping instruction
2f: 74 91 je 0xffffffc2
31: 48 89 df mov %rbx,%rdi
34: e8 4b 01 14 f8 call 0xf8140184
39: eb 87 jmp 0xffffffc2
3b: 48 rex.W
3c: c7 .byte 0xc7
3d: 04 24 add $0x24,%al
3f: 0e (bad)
---
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: f7347f400572 Linux 5.15.180
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=169670d4580000
kernel config: https://syzkaller.appspot.com/x/.config?x=e0a09dd23d715b59
dashboard link: https://syzkaller.appspot.com/bug?extid=20d9f172fbffe19fe12f
compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f174a25d1f90/disk-f7347f40.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2b5ffc4e5dc3/vmlinux-f7347f40.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b48f40123eb9/bzImage-f7347f40.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+20d9f1...@syzkaller.appspotmail.com
BUG: unable to handle page fault for address: ffffed11042dc76f
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 23ffef067 P4D 23ffef067 PUD 0
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 8669 Comm: syz.4.1095 Not tainted 5.15.180-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:constant_test_bit arch/x86/include/asm/bitops.h:207 [inline]
RIP: 0010:test_bit include/asm-generic/bitops/instrumented-non-atomic.h:135 [inline]
RIP: 0010:test_ti_thread_flag include/linux/thread_info.h:118 [inline]
RIP: 0010:need_resched include/linux/sched.h:2111 [inline]
RIP: 0010:preempt_schedule_irq+0xf6/0x150 kernel/sched/core.c:6783
Code: 10 b6 d4 f7 bf 01 00 00 00 e8 96 32 a8 f7 65 48 8b 1d 2e 46 59 76 48 89 df be 08 00 00 00 e8 f1 02 14 f8 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 91 48 89 df e8 4b 01 14 f8 eb 87 48 c7 04 24 0e
RSP: 0018:ffffc900031bf9e0 EFLAGS: 00010802
RAX: 1ffff110042dc770 RBX: ffff8880216e3b80 RCX: ffffffff89a9299f
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8880216e3b80
RBP: ffffc900031bfa90 R08: dffffc0000000000 R09: ffffed10042dc771
R10: ffffed10042dc771 R11: 1ffff110042dc770 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc00ffffffff R15: 1ffff92000637f3c
FS: 00007fee3e0126c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffed11042dc76f CR3: 000000001a1f8000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
irqentry_exit+0x63/0x70 kernel/entry/common.c:432
asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:681
RIP: 0010:memcpy_erms+0x6/0x10 arch/x86/lib/memcpy_64.S:55
Code: fe ff ff 00 eb 1e 0f 1f 00 48 89 f8 48 89 d1 48 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 c3 90 90 90 90 90 90 48 89 f8 48 89 d1 <f3> a4 c3 90 90 90 90 90 90 90 48 89 f8 48 83 fa 20 72 7e 40 38 fe
RSP: 0018:ffffc900031bfb58 EFLAGS: 00010202
RAX: ffff888075948000 RBX: 0000000000000000 RCX: 0000000000000180
RDX: 0000000000000a00 RSI: ffff88805e751880 RDI: ffff888075948880
RBP: ffffc900031bfd28 R08: dffffc0000000000 R09: ffffed100eb29140
R10: 0000000000000000 R11: 0000000000000140 R12: ffff8880227b6000
R13: ffffea000179d440 R14: ffff88801b6881f0 R15: 0000000000000000
ntfs_fill_super+0x302e/0x3c10 fs/ntfs3/super.c:1153
get_tree_bdev+0x3f1/0x610 fs/super.c:1325
vfs_get_tree+0x88/0x270 fs/super.c:1530
do_new_mount+0x24a/0xa40 fs/namespace.c:3012
do_mount fs/namespace.c:3355 [inline]
__do_sys_mount fs/namespace.c:3563 [inline]
__se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3540
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fee401ac10a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fee3e011e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fee3e011ef0 RCX: 00007fee401ac10a
RDX: 0000200000000000 RSI: 0000200000000280 RDI: 00007fee3e011eb0
RBP: 0000200000000000 R08: 00007fee3e011ef0 R09: 0000000002010c14
R10: 0000000002010c14 R11: 0000000000000246 R12: 0000200000000280
R13: 00007fee3e011eb0 R14: 000000000001f75b R15: 00002000000000c0
</TASK>
Modules linked in:
CR2: ffffed11042dc76f
---[ end trace daaf2d8927499dbf ]---
RIP: 0010:constant_test_bit arch/x86/include/asm/bitops.h:207 [inline]
RIP: 0010:test_bit include/asm-generic/bitops/instrumented-non-atomic.h:135 [inline]
RIP: 0010:test_ti_thread_flag include/linux/thread_info.h:118 [inline]
RIP: 0010:need_resched include/linux/sched.h:2111 [inline]
RIP: 0010:preempt_schedule_irq+0xf6/0x150 kernel/sched/core.c:6783
Code: 10 b6 d4 f7 bf 01 00 00 00 e8 96 32 a8 f7 65 48 8b 1d 2e 46 59 76 48 89 df be 08 00 00 00 e8 f1 02 14 f8 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 91 48 89 df e8 4b 01 14 f8 eb 87 48 c7 04 24 0e
RSP: 0018:ffffc900031bf9e0 EFLAGS: 00010802
RAX: 1ffff110042dc770 RBX: ffff8880216e3b80 RCX: ffffffff89a9299f
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8880216e3b80
RBP: ffffc900031bfa90 R08: dffffc0000000000 R09: ffffed10042dc771
R10: ffffed10042dc771 R11: 1ffff110042dc770 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc00ffffffff R15: 1ffff92000637f3c
FS: 00007fee3e0126c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffed11042dc76f CR3: 000000001a1f8000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 10 b6 d4 f7 bf 01 adc %dh,0x1bff7d4(%rsi)
6: 00 00 add %al,(%rax)
8: 00 e8 add %ch,%al
a: 96 xchg %eax,%esi
b: 32 a8 f7 65 48 8b xor -0x74b79a09(%rax),%ch
11: 1d 2e 46 59 76 sbb $0x7659462e,%eax
16: 48 89 df mov %rbx,%rdi
19: be 08 00 00 00 mov $0x8,%esi
1e: e8 f1 02 14 f8 call 0xf8140314
23: 48 89 d8 mov %rbx,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) <-- trapping instruction
2f: 74 91 je 0xffffffc2
31: 48 89 df mov %rbx,%rdi
34: e8 4b 01 14 f8 call 0xf8140184
39: eb 87 jmp 0xffffffc2
3b: 48 rex.W
3c: c7 .byte 0xc7
3d: 04 24 add $0x24,%al
3f: 0e (bad)
---
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
Apr 28, 2025, 10:15:33 AM4/28/25
to syzkaller...@googlegroups.com
syzbot has found a reproducer for the following issue on:
HEAD commit: f7347f400572 Linux 5.15.180
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=135b6374580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=138ad270580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f174a25d1f90/disk-f7347f40.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2b5ffc4e5dc3/vmlinux-f7347f40.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b48f40123eb9/bzImage-f7347f40.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/925689b3c724/mount_0.gz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+20d9f1...@syzkaller.appspotmail.com
loop4: detected capacity change from 0 to 4096
BUG: unable to handle page fault for address: ffffed110539a76f
RAX: 1ffff1100539a770 RBX: ffff888029cd3b80 RCX: ffffffff89a9299f
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff888029cd3b80
RBP: ffffc90002f5fa90 R08: dffffc0000000000 R09: ffffed100539a771
R10: ffffed100539a771 R11: 1ffff1100539a770 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc00ffffffff R15: 1ffff920005ebf3c
FS: 000055556afd0380(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
RAX: ffff88807bebc000 RBX: 0000000000000000 RCX: 00000000000006c0
RDX: 0000000000000a00 RSI: ffff88806e232340 RDI: ffff88807bebc340
RBP: ffffc90002f5fd28 R08: dffffc0000000000 R09: ffffed100f7d7940
R10: 0000000000000000 R11: 0000000000000140 R12: ffff88807bc6e000
R13: ffffea0001b88c80 R14: ffff88807bfd01f0 R15: 0000000000000000
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:00007fffc9d9dcb8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f74c1bed71a
RDX: 0000200000000000 RSI: 0000200000000280 RDI: 00007fffc9d9dd10
RBP: 0000000000000004 R08: 00007fffc9d9dd50 R09: 000000000001f755
R10: 0000000002010c14 R11: 0000000000000206 R12: 0000000000200000
R13: 00007fffc9d9dd50 R14: 0000200000000280 R15: 0000000000000003
</TASK>
Modules linked in:
CR2: ffffed110539a76f
---[ end trace ff50854c5f78486f ]---
RAX: 1ffff1100539a770 RBX: ffff888029cd3b80 RCX: ffffffff89a9299f
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff888029cd3b80
RBP: ffffc90002f5fa90 R08: dffffc0000000000 R09: ffffed100539a771
R10: ffffed100539a771 R11: 1ffff1100539a770 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc00ffffffff R15: 1ffff920005ebf3c
FS: 000055556afd0380(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
HEAD commit: f7347f400572 Linux 5.15.180
git tree: linux-5.15.y
kernel config: https://syzkaller.appspot.com/x/.config?x=e0a09dd23d715b59
dashboard link: https://syzkaller.appspot.com/bug?extid=20d9f172fbffe19fe12f
compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1183e368580000
dashboard link: https://syzkaller.appspot.com/bug?extid=20d9f172fbffe19fe12f
compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=138ad270580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f174a25d1f90/disk-f7347f40.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2b5ffc4e5dc3/vmlinux-f7347f40.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b48f40123eb9/bzImage-f7347f40.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+20d9f1...@syzkaller.appspotmail.com
BUG: unable to handle page fault for address: ffffed110539a76f
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 23ffef067 P4D 23ffef067 PUD 0
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 4206 Comm: syz-executor357 Not tainted 5.15.180-syzkaller #0
#PF: error_code(0x0000) - not-present page
PGD 23ffef067 P4D 23ffef067 PUD 0
Oops: 0000 [#1] PREEMPT SMP KASAN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:constant_test_bit arch/x86/include/asm/bitops.h:207 [inline]
RIP: 0010:test_bit include/asm-generic/bitops/instrumented-non-atomic.h:135 [inline]
RIP: 0010:test_ti_thread_flag include/linux/thread_info.h:118 [inline]
RIP: 0010:need_resched include/linux/sched.h:2111 [inline]
RIP: 0010:preempt_schedule_irq+0xf6/0x150 kernel/sched/core.c:6783
Code: 10 b6 d4 f7 bf 01 00 00 00 e8 96 32 a8 f7 65 48 8b 1d 2e 46 59 76 48 89 df be 08 00 00 00 e8 f1 02 14 f8 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 91 48 89 df e8 4b 01 14 f8 eb 87 48 c7 04 24 0e
RSP: 0018:ffffc90002f5f9e0 EFLAGS: 00010802
RIP: 0010:constant_test_bit arch/x86/include/asm/bitops.h:207 [inline]
RIP: 0010:test_bit include/asm-generic/bitops/instrumented-non-atomic.h:135 [inline]
RIP: 0010:test_ti_thread_flag include/linux/thread_info.h:118 [inline]
RIP: 0010:need_resched include/linux/sched.h:2111 [inline]
RIP: 0010:preempt_schedule_irq+0xf6/0x150 kernel/sched/core.c:6783
Code: 10 b6 d4 f7 bf 01 00 00 00 e8 96 32 a8 f7 65 48 8b 1d 2e 46 59 76 48 89 df be 08 00 00 00 e8 f1 02 14 f8 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 91 48 89 df e8 4b 01 14 f8 eb 87 48 c7 04 24 0e
RAX: 1ffff1100539a770 RBX: ffff888029cd3b80 RCX: ffffffff89a9299f
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff888029cd3b80
RBP: ffffc90002f5fa90 R08: dffffc0000000000 R09: ffffed100539a771
R10: ffffed100539a771 R11: 1ffff1100539a770 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc00ffffffff R15: 1ffff920005ebf3c
FS: 000055556afd0380(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffed110539a76f CR3: 0000000022bd6000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
irqentry_exit+0x63/0x70 kernel/entry/common.c:432
asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:681
RIP: 0010:memcpy_erms+0x6/0x10 arch/x86/lib/memcpy_64.S:55
Code: fe ff ff 00 eb 1e 0f 1f 00 48 89 f8 48 89 d1 48 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 c3 90 90 90 90 90 90 48 89 f8 48 89 d1 <f3> a4 c3 90 90 90 90 90 90 90 48 89 f8 48 83 fa 20 72 7e 40 38 fe
RSP: 0018:ffffc90002f5fb58 EFLAGS: 00010202
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
irqentry_exit+0x63/0x70 kernel/entry/common.c:432
asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:681
RIP: 0010:memcpy_erms+0x6/0x10 arch/x86/lib/memcpy_64.S:55
Code: fe ff ff 00 eb 1e 0f 1f 00 48 89 f8 48 89 d1 48 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 c3 90 90 90 90 90 90 48 89 f8 48 89 d1 <f3> a4 c3 90 90 90 90 90 90 90 48 89 f8 48 83 fa 20 72 7e 40 38 fe
RAX: ffff88807bebc000 RBX: 0000000000000000 RCX: 00000000000006c0
RDX: 0000000000000a00 RSI: ffff88806e232340 RDI: ffff88807bebc340
RBP: ffffc90002f5fd28 R08: dffffc0000000000 R09: ffffed100f7d7940
R10: 0000000000000000 R11: 0000000000000140 R12: ffff88807bc6e000
R13: ffffea0001b88c80 R14: ffff88807bfd01f0 R15: 0000000000000000
ntfs_fill_super+0x302e/0x3c10 fs/ntfs3/super.c:1153
get_tree_bdev+0x3f1/0x610 fs/super.c:1325
vfs_get_tree+0x88/0x270 fs/super.c:1530
do_new_mount+0x24a/0xa40 fs/namespace.c:3012
do_mount fs/namespace.c:3355 [inline]
__do_sys_mount fs/namespace.c:3563 [inline]
__se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3540
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f74c1bed71a
get_tree_bdev+0x3f1/0x610 fs/super.c:1325
vfs_get_tree+0x88/0x270 fs/super.c:1530
do_new_mount+0x24a/0xa40 fs/namespace.c:3012
do_mount fs/namespace.c:3355 [inline]
__do_sys_mount fs/namespace.c:3563 [inline]
__se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3540
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
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:00007fffc9d9dcb8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f74c1bed71a
RDX: 0000200000000000 RSI: 0000200000000280 RDI: 00007fffc9d9dd10
RBP: 0000000000000004 R08: 00007fffc9d9dd50 R09: 000000000001f755
R10: 0000000002010c14 R11: 0000000000000206 R12: 0000000000200000
R13: 00007fffc9d9dd50 R14: 0000200000000280 R15: 0000000000000003
</TASK>
Modules linked in:
CR2: ffffed110539a76f
---[ end trace ff50854c5f78486f ]---
RIP: 0010:constant_test_bit arch/x86/include/asm/bitops.h:207 [inline]
RIP: 0010:test_bit include/asm-generic/bitops/instrumented-non-atomic.h:135 [inline]
RIP: 0010:test_ti_thread_flag include/linux/thread_info.h:118 [inline]
RIP: 0010:need_resched include/linux/sched.h:2111 [inline]
RIP: 0010:preempt_schedule_irq+0xf6/0x150 kernel/sched/core.c:6783
Code: 10 b6 d4 f7 bf 01 00 00 00 e8 96 32 a8 f7 65 48 8b 1d 2e 46 59 76 48 89 df be 08 00 00 00 e8 f1 02 14 f8 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 91 48 89 df e8 4b 01 14 f8 eb 87 48 c7 04 24 0e
RSP: 0018:ffffc90002f5f9e0 EFLAGS: 00010802
RIP: 0010:test_bit include/asm-generic/bitops/instrumented-non-atomic.h:135 [inline]
RIP: 0010:test_ti_thread_flag include/linux/thread_info.h:118 [inline]
RIP: 0010:need_resched include/linux/sched.h:2111 [inline]
RIP: 0010:preempt_schedule_irq+0xf6/0x150 kernel/sched/core.c:6783
Code: 10 b6 d4 f7 bf 01 00 00 00 e8 96 32 a8 f7 65 48 8b 1d 2e 46 59 76 48 89 df be 08 00 00 00 e8 f1 02 14 f8 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 91 48 89 df e8 4b 01 14 f8 eb 87 48 c7 04 24 0e
RAX: 1ffff1100539a770 RBX: ffff888029cd3b80 RCX: ffffffff89a9299f
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff888029cd3b80
RBP: ffffc90002f5fa90 R08: dffffc0000000000 R09: ffffed100539a771
R10: ffffed100539a771 R11: 1ffff1100539a770 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc00ffffffff R15: 1ffff920005ebf3c
FS: 000055556afd0380(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffed110539a76f CR3: 0000000022bd6000 CR4: 00000000003506e0
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
syzbot
Oct 2, 2025, 4:59:04 PM10/2/25
to syzkaller...@googlegroups.com
syzbot suspects this issue was fixed by commit:
commit 03b40bf5d0389ca23ae6857ee25789f0e0b47ce8
Author: Ye Bin <yeb...@huawei.com>
Date: Mon Aug 11 14:18:30 2025 +0000
fs/buffer: fix use-after-free when call bh_read() helper
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=13401ee2580000
start commit: 3b8db0e4f263 Linux 5.15.182
git tree: linux-5.15.y
kernel config: https://syzkaller.appspot.com/x/.config?x=f93aaf95aed43225
dashboard link: https://syzkaller.appspot.com/bug?extid=20d9f172fbffe19fe12f
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12dbb4d4580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16d2d768580000
If the result looks correct, please mark the issue as fixed by replying with:
#syz fix: fs/buffer: fix use-after-free when call bh_read() helper
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
commit 03b40bf5d0389ca23ae6857ee25789f0e0b47ce8
Author: Ye Bin <yeb...@huawei.com>
Date: Mon Aug 11 14:18:30 2025 +0000
fs/buffer: fix use-after-free when call bh_read() helper
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=13401ee2580000
start commit: 3b8db0e4f263 Linux 5.15.182
git tree: linux-5.15.y
kernel config: https://syzkaller.appspot.com/x/.config?x=f93aaf95aed43225
dashboard link: https://syzkaller.appspot.com/bug?extid=20d9f172fbffe19fe12f
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12dbb4d4580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16d2d768580000
If the result looks correct, please mark the issue as fixed by replying with:
#syz fix: fs/buffer: fix use-after-free when call bh_read() helper
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
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