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006d021491bc7-6776978dc3fmr1329805eaf.64.1771021054419; Fri, 13 Feb 2026 14:17:34 -0800 (PST) Date: Fri, 13 Feb 2026 14:17:34 -0800 In-Reply-To: <68b7284f.050a0220.3db4df.01d7.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <698fa2fe.a70a0220.3c8f9c.0076.GAE@google.com> Subject: Re: [syzbot] [hams?] WARNING: ODEBUG bug in __run_timers (3) From: syzbot To: davem@davemloft.net, edumazet@google.com, horms@kernel.org, kuba@kernel.org, linux-hams@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: cee73b1e840c Merge tag 'riscv-for-linus-7.0-mw1' of git://.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15eae15a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=f71c66df48515cc1 dashboard link: https://syzkaller.appspot.com/bug?extid=7287222a6d88bdb559a7 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12f68722580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=114c6b3a580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-cee73b1e.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/075d9080a7b6/vmlinux-cee73b1e.xz kernel image: https://storage.googleapis.com/syzbot-assets/98697e710988/bzImage-cee73b1e.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+7287222a6d88bdb559a7@syzkaller.appspotmail.com ------------[ cut here ]------------ ODEBUG: free active (active state 0) object: ffff8880375c4c90 object type: timer_list hint: rose_t0timer_expiry+0x0/0x150 include/linux/skbuff.h:2928 WARNING: lib/debugobjects.c:612 at debug_print_object+0x18e/0x2a0 lib/debugobjects.c:612, CPU#3: swapper/3/0 Modules linked in: CPU: 3 UID: 0 PID: 0 Comm: swapper/3 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:debug_print_object+0x19b/0x2a0 lib/debugobjects.c:612 Code: b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 4f 48 8d 3d 72 78 ee 0b 41 56 48 8b 14 dd 60 ec 1a 8c 4c 89 e6 <67> 48 0f b9 3a 58 83 05 9c 48 e4 0b 01 48 83 c4 18 5b 5d 41 5c 41 RSP: 0018:ffffc900006f8a38 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000003 RCX: 0000000000000000 RDX: ffffffff8c1aeba0 RSI: ffffffff8c1ae7c0 RDI: ffffffff90e333c0 RBP: 0000000000000001 R08: ffff8880375c4c90 R09: ffffffff8bb2c880 R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8c1ae7c0 R13: ffffffff8bb2c8c0 R14: ffffffff8a6eed50 R15: ffffc900006f8b38 FS: 0000000000000000(0000) GS:ffff8880d668b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4962e00ff8 CR3: 000000003801e000 CR4: 0000000000352ef0 Call Trace: __debug_check_no_obj_freed lib/debugobjects.c:1099 [inline] debug_check_no_obj_freed+0x4da/0x630 lib/debugobjects.c:1129 slab_free_hook mm/slub.c:2601 [inline] slab_free mm/slub.c:6082 [inline] kfree+0x343/0x670 mm/slub.c:6399 rose_neigh_put include/net/rose.h:166 [inline] rose_timer_expiry+0x53f/0x630 net/rose/rose_timer.c:183 call_timer_fn+0x19a/0x590 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers+0x757/0xac0 kernel/time/timer.c:2373 __run_timer_base kernel/time/timer.c:2385 [inline] __run_timer_base kernel/time/timer.c:2377 [inline] run_timer_base+0x114/0x190 kernel/time/timer.c:2394 run_timer_softirq+0x1a/0x50 kernel/time/timer.c:2404 handle_softirqs+0x1ea/0x910 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0xef/0x150 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa3/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:63 Code: 0e 91 02 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa eb 07 0f 00 2d 83 ed 2a 00 fb f4 3c 34 03 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 RSP: 0018:ffffc90000197df0 EFLAGS: 00000202 RAX: 0000000000128aa1 RBX: ffff88801ee8a480 RCX: ffffffff8b80ac75 RDX: 0000000000000000 RSI: ffffffff8de6b9c0 RDI: ffffffff8c1adaa0 RBP: 0000000000000003 R08: 0000000000000001 R09: ffffed100d4e6755 R10: ffff88806a733aab R11: 0000000000000000 R12: ffffed1003dd1490 R13: 0000000000000003 R14: ffffffff90d8d0d0 R15: 0000000000000000 arch_safe_halt arch/x86/include/asm/paravirt.h:73 [inline] default_idle+0x9/0x10 arch/x86/kernel/process.c:767 default_idle_call+0x6c/0xb0 kernel/sched/idle.c:122 cpuidle_idle_call kernel/sched/idle.c:191 [inline] do_idle+0x35b/0x4b0 kernel/sched/idle.c:332 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:430 start_secondary+0x21d/0x2d0 arch/x86/kernel/smpboot.c:312 common_startup_64+0x13e/0x148 ---------------- Code disassembly (best guess): 0: b8 00 00 00 00 mov $0x0,%eax 5: 00 fc add %bh,%ah 7: ff lcall (bad) 8: df 48 89 fisttps -0x77(%rax) b: fa cli c: 48 c1 ea 03 shr $0x3,%rdx 10: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 14: 75 4f jne 0x65 16: 48 8d 3d 72 78 ee 0b lea 0xbee7872(%rip),%rdi # 0xbee788f 1d: 41 56 push %r14 1f: 48 8b 14 dd 60 ec 1a mov -0x73e513a0(,%rbx,8),%rdx 26: 8c 27: 4c 89 e6 mov %r12,%rsi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 58 pop %rax 30: 83 05 9c 48 e4 0b 01 addl $0x1,0xbe4489c(%rip) # 0xbe448d3 37: 48 83 c4 18 add $0x18,%rsp 3b: 5b pop %rbx 3c: 5d pop %rbp 3d: 41 5c pop %r12 3f: 41 rex.B --- 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.