[Android 5.4] BUG: unable to handle kernel NULL pointer dereference in call_timer_fn (3)
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syzbot
Mar 27, 2025, 2:17:28 PM3/27/25
to syzkaller-a...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 41adfeb3d639 UPSTREAM: net: sched: Disallow replacing of c..
git tree: android12-5.4
console output: https://syzkaller.appspot.com/x/log.txt?x=129cede4580000
kernel config: https://syzkaller.appspot.com/x/.config?x=55297da5fb1e8eb8
dashboard link: https://syzkaller.appspot.com/bug?extid=1d4ec94bcc450f119aea
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=14c84678580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=114d1bb0580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/2e602f01ae74/disk-41adfeb3.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2898a1b44d19/vmlinux-41adfeb3.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b23108325bea/bzImage-41adfeb3.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1d4ec9...@syzkaller.appspotmail.com
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 0 P4D 0
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.4.290-syzkaller-00002-g41adfeb3d639 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: events bpf_map_free_deferred
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09d18 EFLAGS: 00010206
RAX: ffffffff8154e8ca RBX: 0000000000000100 RCX: ffff8881f5d64ec0
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8881d9d271c0
RBP: ffff8881f6e09ec8 R08: ffffffff8154e50e R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffff9b40
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881d9d271c0
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001d8f8c000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
call_timer_fn+0x36/0x390 kernel/time/timer.c:1448
expire_timers kernel/time/timer.c:1493 [inline]
__run_timers+0x879/0xbe0 kernel/time/timer.c:1817
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1830
__do_softirq+0x23b/0x6b7 kernel/softirq.c:292
invoke_softirq kernel/softirq.c:373 [inline]
irq_exit+0x195/0x1c0 kernel/softirq.c:413
exiting_irq arch/x86/include/asm/apic.h:539 [inline]
smp_apic_timer_interrupt+0x11a/0x490 arch/x86/kernel/apic/apic.c:1161
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
</IRQ>
RIP: 0010:arch_stack_walk+0xed/0x140 arch/x86/kernel/stacktrace.c:26
Code: 0b 00 00 eb 03 48 89 e9 48 8d bd 70 ff ff ff 4c 89 e6 4c 89 fa e8 53 0a 06 00 83 bd 70 ff ff ff 00 74 34 48 8d 9d 70 ff ff ff <48> 89 df e8 6b e6 05 00 48 85 c0 74 20 4c 89 f7 48 89 c6 31 d2 41
RSP: 0018:ffff8881f5da7820 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13
RAX: 0000000080000001 RBX: ffff8881f5da7820 RCX: e83deeeaa0fcf100
RDX: ffff8881f5da7860 RSI: ffff8881f5da74a0 RDI: 0000000000000001
RBP: ffff8881f5da78b0 R08: dffffc0000000000 R09: ffff8881f5da7870
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881f5d64ec0
R13: ffffffff8153c430 R14: ffff8881f5da7900 R15: 0000000000000000
stack_trace_save+0x118/0x1c0 kernel/stacktrace.c:123
save_stack+0x95/0x880 mm/page_owner.c:122
__reset_page_owner+0x1f/0x100 mm/page_owner.c:149
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1176 [inline]
free_pcp_prepare mm/page_alloc.c:1233 [inline]
free_unref_page_prepare+0x297/0x380 mm/page_alloc.c:3085
free_unref_page mm/page_alloc.c:3134 [inline]
free_the_page mm/page_alloc.c:4953 [inline]
__free_pages+0xaf/0x140 mm/page_alloc.c:4961
__vunmap+0x75b/0x890 mm/vmalloc.c:2260
htab_free_elems kernel/bpf/hashtab.c:116 [inline]
prealloc_destroy kernel/bpf/hashtab.c:194 [inline]
htab_map_free+0x515/0x670 kernel/bpf/hashtab.c:1238
bpf_map_free_deferred+0xa8/0x100 kernel/bpf/syscall.c:311
process_one_work+0x765/0xd20 kernel/workqueue.c:2290
worker_thread+0xaef/0x1470 kernel/workqueue.c:2436
kthread+0x2da/0x360 kernel/kthread.c:288
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:354
Modules linked in:
CR2: 0000000000000000
---[ end trace 24f2c7bca5dc6bf2 ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09d18 EFLAGS: 00010206
RAX: ffffffff8154e8ca RBX: 0000000000000100 RCX: ffff8881f5d64ec0
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8881d9d271c0
RBP: ffff8881f6e09ec8 R08: ffffffff8154e50e R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffff9b40
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881d9d271c0
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001d8f8c000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 1 bytes skipped:
0: 00 00 add %al,(%rax)
2: eb 03 jmp 0x7
4: 48 89 e9 mov %rbp,%rcx
7: 48 8d bd 70 ff ff ff lea -0x90(%rbp),%rdi
e: 4c 89 e6 mov %r12,%rsi
11: 4c 89 fa mov %r15,%rdx
14: e8 53 0a 06 00 call 0x60a6c
19: 83 bd 70 ff ff ff 00 cmpl $0x0,-0x90(%rbp)
20: 74 34 je 0x56
22: 48 8d 9d 70 ff ff ff lea -0x90(%rbp),%rbx
* 29: 48 89 df mov %rbx,%rdi <-- trapping instruction
2c: e8 6b e6 05 00 call 0x5e69c
31: 48 85 c0 test %rax,%rax
34: 74 20 je 0x56
36: 4c 89 f7 mov %r14,%rdi
39: 48 89 c6 mov %rax,%rsi
3c: 31 d2 xor %edx,%edx
3e: 41 rex.B
---
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 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.
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: 41adfeb3d639 UPSTREAM: net: sched: Disallow replacing of c..
git tree: android12-5.4
console output: https://syzkaller.appspot.com/x/log.txt?x=129cede4580000
kernel config: https://syzkaller.appspot.com/x/.config?x=55297da5fb1e8eb8
dashboard link: https://syzkaller.appspot.com/bug?extid=1d4ec94bcc450f119aea
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=14c84678580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=114d1bb0580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/2e602f01ae74/disk-41adfeb3.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2898a1b44d19/vmlinux-41adfeb3.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b23108325bea/bzImage-41adfeb3.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1d4ec9...@syzkaller.appspotmail.com
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 0 P4D 0
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.4.290-syzkaller-00002-g41adfeb3d639 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: events bpf_map_free_deferred
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09d18 EFLAGS: 00010206
RAX: ffffffff8154e8ca RBX: 0000000000000100 RCX: ffff8881f5d64ec0
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8881d9d271c0
RBP: ffff8881f6e09ec8 R08: ffffffff8154e50e R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffff9b40
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881d9d271c0
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001d8f8c000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
call_timer_fn+0x36/0x390 kernel/time/timer.c:1448
expire_timers kernel/time/timer.c:1493 [inline]
__run_timers+0x879/0xbe0 kernel/time/timer.c:1817
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1830
__do_softirq+0x23b/0x6b7 kernel/softirq.c:292
invoke_softirq kernel/softirq.c:373 [inline]
irq_exit+0x195/0x1c0 kernel/softirq.c:413
exiting_irq arch/x86/include/asm/apic.h:539 [inline]
smp_apic_timer_interrupt+0x11a/0x490 arch/x86/kernel/apic/apic.c:1161
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
</IRQ>
RIP: 0010:arch_stack_walk+0xed/0x140 arch/x86/kernel/stacktrace.c:26
Code: 0b 00 00 eb 03 48 89 e9 48 8d bd 70 ff ff ff 4c 89 e6 4c 89 fa e8 53 0a 06 00 83 bd 70 ff ff ff 00 74 34 48 8d 9d 70 ff ff ff <48> 89 df e8 6b e6 05 00 48 85 c0 74 20 4c 89 f7 48 89 c6 31 d2 41
RSP: 0018:ffff8881f5da7820 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13
RAX: 0000000080000001 RBX: ffff8881f5da7820 RCX: e83deeeaa0fcf100
RDX: ffff8881f5da7860 RSI: ffff8881f5da74a0 RDI: 0000000000000001
RBP: ffff8881f5da78b0 R08: dffffc0000000000 R09: ffff8881f5da7870
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881f5d64ec0
R13: ffffffff8153c430 R14: ffff8881f5da7900 R15: 0000000000000000
stack_trace_save+0x118/0x1c0 kernel/stacktrace.c:123
save_stack+0x95/0x880 mm/page_owner.c:122
__reset_page_owner+0x1f/0x100 mm/page_owner.c:149
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1176 [inline]
free_pcp_prepare mm/page_alloc.c:1233 [inline]
free_unref_page_prepare+0x297/0x380 mm/page_alloc.c:3085
free_unref_page mm/page_alloc.c:3134 [inline]
free_the_page mm/page_alloc.c:4953 [inline]
__free_pages+0xaf/0x140 mm/page_alloc.c:4961
__vunmap+0x75b/0x890 mm/vmalloc.c:2260
htab_free_elems kernel/bpf/hashtab.c:116 [inline]
prealloc_destroy kernel/bpf/hashtab.c:194 [inline]
htab_map_free+0x515/0x670 kernel/bpf/hashtab.c:1238
bpf_map_free_deferred+0xa8/0x100 kernel/bpf/syscall.c:311
process_one_work+0x765/0xd20 kernel/workqueue.c:2290
worker_thread+0xaef/0x1470 kernel/workqueue.c:2436
kthread+0x2da/0x360 kernel/kthread.c:288
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:354
Modules linked in:
CR2: 0000000000000000
---[ end trace 24f2c7bca5dc6bf2 ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09d18 EFLAGS: 00010206
RAX: ffffffff8154e8ca RBX: 0000000000000100 RCX: ffff8881f5d64ec0
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8881d9d271c0
RBP: ffff8881f6e09ec8 R08: ffffffff8154e50e R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffff9b40
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881d9d271c0
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001d8f8c000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 1 bytes skipped:
0: 00 00 add %al,(%rax)
2: eb 03 jmp 0x7
4: 48 89 e9 mov %rbp,%rcx
7: 48 8d bd 70 ff ff ff lea -0x90(%rbp),%rdi
e: 4c 89 e6 mov %r12,%rsi
11: 4c 89 fa mov %r15,%rdx
14: e8 53 0a 06 00 call 0x60a6c
19: 83 bd 70 ff ff ff 00 cmpl $0x0,-0x90(%rbp)
20: 74 34 je 0x56
22: 48 8d 9d 70 ff ff ff lea -0x90(%rbp),%rbx
* 29: 48 89 df mov %rbx,%rdi <-- trapping instruction
2c: e8 6b e6 05 00 call 0x5e69c
31: 48 85 c0 test %rax,%rax
34: 74 20 je 0x56
36: 4c 89 f7 mov %r14,%rdi
39: 48 89 c6 mov %rax,%rsi
3c: 31 d2 xor %edx,%edx
3e: 41 rex.B
---
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 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.
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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