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Message-ID: <67fb3265.050a0220.2c5fcf.001a.GAE@google.com> Date: Sat, 12 Apr 2025 20:41:25 -0700 From: syzbot <syzbot+5c042fbab0b292c98fc6@...kaller.appspotmail.com> To: dhowells@...hat.com, linux-afs@...ts.infradead.org, linux-kernel@...r.kernel.org, marc.dionne@...istor.com, syzkaller-bugs@...glegroups.com Subject: [syzbot] [afs?] BUG: unable to handle kernel paging request in afs_put_vlserverlist Hello, syzbot found the following issue on: HEAD commit: bec7dcbc242c Merge tag 'probes-fixes-v6.14' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13067a74580000 kernel config: https://syzkaller.appspot.com/x/.config?x=7a4e108575159039 dashboard link: https://syzkaller.appspot.com/bug?extid=5c042fbab0b292c98fc6 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=179b323f980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17fe17cf980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/36d8f571e9a9/disk-bec7dcbc.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/3fc027e5e923/vmlinux-bec7dcbc.xz kernel image: https://storage.googleapis.com/syzbot-assets/964a62b47535/bzImage-bec7dcbc.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5c042fbab0b292c98fc6@...kaller.appspotmail.com kAFS: bad VL server IP address BUG: unable to handle page fault for address: fffffffffffffffa #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD e186067 P4D e186067 PUD e188067 PMD 0 Oops: Oops: 0002 [#1] SMP KASAN PTI CPU: 1 UID: 0 PID: 5834 Comm: syz-executor362 Not tainted 6.15.0-rc1-syzkaller-00025-gbec7dcbc242c #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:arch_atomic_fetch_add arch/x86/include/asm/atomic.h:93 [inline] RIP: 0010:raw_atomic_fetch_sub_release include/linux/atomic/atomic-arch-fallback.h:949 [inline] RIP: 0010:atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:401 [inline] RIP: 0010:__refcount_sub_and_test include/linux/refcount.h:389 [inline] RIP: 0010:__refcount_dec_and_test include/linux/refcount.h:432 [inline] RIP: 0010:refcount_dec_and_test include/linux/refcount.h:450 [inline] RIP: 0010:afs_put_vlserverlist+0x3a/0x220 fs/afs/vl_list.c:67 Code: 53 48 83 ec 18 e8 e6 35 2f fe 48 85 ed 74 43 e8 dc 35 2f fe 4c 8d 65 10 be 04 00 00 00 bb ff ff ff ff 4c 89 e7 e8 76 ad 93 fe <f0> 0f c1 5d 10 31 ff 89 de e8 f8 30 2f fe 85 db 7e 29 e8 af 35 2f RSP: 0018:ffffc90003e5fae0 EFLAGS: 00010246 RAX: 0000000000000001 RBX: 00000000ffffffff RCX: ffffffff838c071a RDX: fffffc0000000000 RSI: 0000000000000004 RDI: fffffffffffffffa RBP: ffffffffffffffea R08: 0000000000000001 R09: fffffbffffffffff R10: fffffffffffffffd R11: 0000000000000001 R12: fffffffffffffffa R13: ffffffffffffffea R14: ffff8880216ad700 R15: ffff888034ec2000 FS: 0000555561d3e380(0000) GS:ffff888124ab9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffffffffffffa CR3: 000000007a922000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> afs_alloc_cell fs/afs/cell.c:218 [inline] afs_lookup_cell+0x12a5/0x1680 fs/afs/cell.c:264 afs_cell_init+0x17a/0x380 fs/afs/cell.c:386 afs_proc_rootcell_write+0x21f/0x290 fs/afs/proc.c:247 proc_simple_write+0x114/0x1b0 fs/proc/generic.c:825 pde_write fs/proc/inode.c:330 [inline] proc_reg_write+0x23d/0x330 fs/proc/inode.c:342 vfs_write+0x25c/0x1180 fs/read_write.c:682 ksys_write+0x12a/0x240 fs/read_write.c:736 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fab4ed8ba79 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007fff0c666448 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000200000000000 RCX: 00007fab4ed8ba79 RDX: 000000000000009e RSI: 0000200000000200 RDI: 0000000000000003 RBP: 00007fab4edfe5f0 R08: 0000000000000006 R09: 0000000000000006 R10: 0000000000000006 R11: 0000000000000246 R12: 0000000000000001 R13: 431bde82d7b634db R14: 0000000000000001 R15: 0000000000000001 </TASK> Modules linked in: CR2: fffffffffffffffa ---[ end trace 0000000000000000 ]--- RIP: 0010:arch_atomic_fetch_add arch/x86/include/asm/atomic.h:93 [inline] RIP: 0010:raw_atomic_fetch_sub_release include/linux/atomic/atomic-arch-fallback.h:949 [inline] RIP: 0010:atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:401 [inline] RIP: 0010:__refcount_sub_and_test include/linux/refcount.h:389 [inline] RIP: 0010:__refcount_dec_and_test include/linux/refcount.h:432 [inline] RIP: 0010:refcount_dec_and_test include/linux/refcount.h:450 [inline] RIP: 0010:afs_put_vlserverlist+0x3a/0x220 fs/afs/vl_list.c:67 Code: 53 48 83 ec 18 e8 e6 35 2f fe 48 85 ed 74 43 e8 dc 35 2f fe 4c 8d 65 10 be 04 00 00 00 bb ff ff ff ff 4c 89 e7 e8 76 ad 93 fe <f0> 0f c1 5d 10 31 ff 89 de e8 f8 30 2f fe 85 db 7e 29 e8 af 35 2f RSP: 0018:ffffc90003e5fae0 EFLAGS: 00010246 RAX: 0000000000000001 RBX: 00000000ffffffff RCX: ffffffff838c071a RDX: fffffc0000000000 RSI: 0000000000000004 RDI: fffffffffffffffa RBP: ffffffffffffffea R08: 0000000000000001 R09: fffffbffffffffff R10: fffffffffffffffd R11: 0000000000000001 R12: fffffffffffffffa R13: ffffffffffffffea R14: ffff8880216ad700 R15: ffff888034ec2000 FS: 0000555561d3e380(0000) GS:ffff888124ab9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffffffffffffa CR3: 000000007a922000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 53 push %rbx 1: 48 83 ec 18 sub $0x18,%rsp 5: e8 e6 35 2f fe call 0xfe2f35f0 a: 48 85 ed test %rbp,%rbp d: 74 43 je 0x52 f: e8 dc 35 2f fe call 0xfe2f35f0 14: 4c 8d 65 10 lea 0x10(%rbp),%r12 18: be 04 00 00 00 mov $0x4,%esi 1d: bb ff ff ff ff mov $0xffffffff,%ebx 22: 4c 89 e7 mov %r12,%rdi 25: e8 76 ad 93 fe call 0xfe93ada0 * 2a: f0 0f c1 5d 10 lock xadd %ebx,0x10(%rbp) <-- trapping instruction 2f: 31 ff xor %edi,%edi 31: 89 de mov %ebx,%esi 33: e8 f8 30 2f fe call 0xfe2f3130 38: 85 db test %ebx,%ebx 3a: 7e 29 jle 0x65 3c: e8 .byte 0xe8 3d: af scas %es:(%rdi),%eax 3e: 35 .byte 0x35 3f: 2f (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 syzkaller@...glegroups.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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