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Message-ID: <67dfe2bd.050a0220.31a16b.005c.GAE@google.com> Date: Sun, 23 Mar 2025 03:30:21 -0700 From: syzbot <syzbot+9911f8283beca191268b@...kaller.appspotmail.com> To: davem@...emloft.net, edumazet@...gle.com, horms@...nel.org, kuba@...nel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com Subject: Re: [syzbot] [net?] BUG: unable to handle kernel paging request in dst_dev_put (2) syzbot has found a reproducer for the following issue on: HEAD commit: 183601b78a9b Merge tag 'perf-urgent-2025-03-22' of git://g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13b9443f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=27515cfdbafbb90d dashboard link: https://syzkaller.appspot.com/bug?extid=9911f8283beca191268b 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=129cdc4c580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-183601b7.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/517fad16d32e/vmlinux-183601b7.xz kernel image: https://storage.googleapis.com/syzbot-assets/1fbe51b195ec/bzImage-183601b7.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/5475b0a1ea33/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9911f8283beca191268b@...kaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 0 UID: 0 PID: 5660 Comm: rm Not tainted 6.14.0-rc7-syzkaller-00202-g183601b78a9b #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:dst_dev_put+0x27/0x290 net/core/dst.c:146 Code: 90 90 90 f3 0f 1e fa 55 41 57 41 56 41 55 41 54 53 49 89 fd 49 bf 00 00 00 00 00 fc ff df e8 50 9f f2 f7 4d 89 ec 49 c1 ec 03 <43> 80 3c 3c 00 74 08 4c 89 ef e8 ca de 59 f8 4d 8b 75 00 49 8d 7d RSP: 0018:ffffc90000007b30 EFLAGS: 00010246 RAX: ffffffff89cf4080 RBX: 0000000000000001 RCX: ffff8880348bc880 RDX: 0000000000000100 RSI: 0000000000000008 RDI: 0000000000000001 RBP: ffff88801fc00000 R08: ffffe8ffffc8df1f R09: 1ffffd1ffff91be3 R10: dffffc0000000000 R11: fffff91ffff91be4 R12: 0000000000000000 R13: 0000000000000001 R14: ffff888012569510 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f478d4afd11 CR3: 0000000058e7a000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> fib6_nh_release_dsts net/ipv6/route.c:3690 [inline] fib6_nh_release+0x355/0x420 net/ipv6/route.c:3671 fib6_info_destroy_rcu+0xc0/0x1b0 net/ipv6/ip6_fib.c:177 rcu_do_batch kernel/rcu/tree.c:2546 [inline] rcu_core+0xaaa/0x17a0 kernel/rcu/tree.c:2802 handle_softirqs+0x2d4/0x9b0 kernel/softirq.c:561 __do_softirq kernel/softirq.c:595 [inline] invoke_softirq kernel/softirq.c:435 [inline] __irq_exit_rcu+0xf7/0x220 kernel/softirq.c:662 irq_exit_rcu+0x9/0x30 kernel/softirq.c:678 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xd8/0x140 kernel/locking/spinlock.c:194 Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 9e 58 1d f6 f6 44 24 21 02 75 52 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> b3 bc 83 f5 65 8b 05 a4 0f f8 73 85 c0 74 43 48 c7 04 24 0e 36 RSP: 0018:ffffc9000cd2f680 EFLAGS: 00000206 RAX: 74f1bd27331e4e00 RBX: 1ffff920019a5ed4 RCX: ffffffff9a654903 RDX: dffffc0000000000 RSI: ffffffff8c2ab3a0 RDI: 0000000000000001 RBP: ffffc9000cd2f710 R08: ffffffff903cfb77 R09: 1ffffffff2079f6e R10: dffffc0000000000 R11: fffffbfff2079f6f R12: dffffc0000000000 R13: 1ffff920019a5ed0 R14: ffffc9000cd2f6a0 R15: 0000000000000246 __debug_check_no_obj_freed lib/debugobjects.c:1108 [inline] debug_check_no_obj_freed+0x561/0x580 lib/debugobjects.c:1129 slab_free_hook mm/slub.c:2284 [inline] slab_free mm/slub.c:4609 [inline] kmem_cache_free+0x114/0x410 mm/slub.c:4711 file_free+0x24/0x200 fs/file_table.c:68 path_openat+0x2edd/0x3590 fs/namei.c:3998 do_filp_open+0x27f/0x4e0 fs/namei.c:4016 do_sys_openat2+0x13e/0x1d0 fs/open.c:1428 do_sys_open fs/open.c:1443 [inline] __do_sys_openat fs/open.c:1459 [inline] __se_sys_openat fs/open.c:1454 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1454 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f478d4c8a46 Code: 10 00 00 00 44 8b 54 24 e0 48 89 44 24 c0 48 8d 44 24 d0 48 89 44 24 c8 44 89 c2 4c 89 ce bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 76 0c f7 d8 89 05 0a 48 01 00 48 83 c8 ff c3 31 RSP: 002b:00007ffd8b657538 EFLAGS: 00000287 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007ffd8b6577a8 RCX: 00007f478d4c8a46 RDX: 0000000000080000 RSI: 00007ffd8b6575b0 RDI: 00000000ffffff9c RBP: 00007ffd8b6575a0 R08: 0000000000080000 R09: 00007ffd8b6575b0 R10: 0000000000000000 R11: 0000000000000287 R12: 00007ffd8b6575b0 R13: 0000000000000003 R14: 00007ffd8b65778f R15: 00000000ffffffff </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:dst_dev_put+0x27/0x290 net/core/dst.c:146 Code: 90 90 90 f3 0f 1e fa 55 41 57 41 56 41 55 41 54 53 49 89 fd 49 bf 00 00 00 00 00 fc ff df e8 50 9f f2 f7 4d 89 ec 49 c1 ec 03 <43> 80 3c 3c 00 74 08 4c 89 ef e8 ca de 59 f8 4d 8b 75 00 49 8d 7d RSP: 0018:ffffc90000007b30 EFLAGS: 00010246 RAX: ffffffff89cf4080 RBX: 0000000000000001 RCX: ffff8880348bc880 RDX: 0000000000000100 RSI: 0000000000000008 RDI: 0000000000000001 RBP: ffff88801fc00000 R08: ffffe8ffffc8df1f R09: 1ffffd1ffff91be3 R10: dffffc0000000000 R11: fffff91ffff91be4 R12: 0000000000000000 R13: 0000000000000001 R14: ffff888012569510 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f478d4afd11 CR3: 0000000058e7a000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 90 nop 1: 90 nop 2: 90 nop 3: f3 0f 1e fa endbr64 7: 55 push %rbp 8: 41 57 push %r15 a: 41 56 push %r14 c: 41 55 push %r13 e: 41 54 push %r12 10: 53 push %rbx 11: 49 89 fd mov %rdi,%r13 14: 49 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%r15 1b: fc ff df 1e: e8 50 9f f2 f7 call 0xf7f29f73 23: 4d 89 ec mov %r13,%r12 26: 49 c1 ec 03 shr $0x3,%r12 * 2a: 43 80 3c 3c 00 cmpb $0x0,(%r12,%r15,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 ef mov %r13,%rdi 34: e8 ca de 59 f8 call 0xf859df03 39: 4d 8b 75 00 mov 0x0(%r13),%r14 3d: 49 rex.WB 3e: 8d .byte 0x8d 3f: 7d .byte 0x7d --- 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.
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