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Message-ID: <67425f74.050a0220.1cc393.0020.GAE@google.com> Date: Sat, 23 Nov 2024 15:04:20 -0800 From: syzbot <syzbot+6df45dd3d03e1a9aca96@...kaller.appspotmail.com> To: gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, rafael@...nel.org, syzkaller-bugs@...glegroups.com Subject: [syzbot] [kernel?] general protection fault in bnep_session Hello, syzbot found the following issue on: HEAD commit: fcc79e1714e8 Merge tag 'net-next-6.13' of git://git.kernel.. git tree: net console output: https://syzkaller.appspot.com/x/log.txt?x=135bbb78580000 kernel config: https://syzkaller.appspot.com/x/.config?x=275de99a754927af dashboard link: https://syzkaller.appspot.com/bug?extid=6df45dd3d03e1a9aca96 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/1539da626e54/disk-fcc79e17.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d44dbcc68df2/vmlinux-fcc79e17.xz kernel image: https://storage.googleapis.com/syzbot-assets/76fdad1309ae/bzImage-fcc79e17.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6df45dd3d03e1a9aca96@...kaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc000000000b: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000058-0x000000000000005f] CPU: 0 UID: 0 PID: 8179 Comm: kbnepd bnep0 Not tainted 6.12.0-syzkaller-05480-gfcc79e1714e8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:klist_put lib/klist.c:212 [inline] RIP: 0010:klist_del+0x49/0x110 lib/klist.c:230 Code: f5 4d 89 f5 49 c1 ed 03 43 80 7c 25 00 00 74 08 4c 89 f7 e8 f9 77 3d f6 49 8b 1e 48 83 e3 fe 48 8d 7b 58 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 05 e8 db 77 3d f6 4c 8b 7b 58 48 89 df e8 2f 99 RSP: 0000:ffffc9000b91f828 EFLAGS: 00010202 RAX: 000000000000000b RBX: 0000000000000000 RCX: ffff88807e749e00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000058 RBP: ffffc9000b91f950 R08: ffffffff823dd8ba R09: 1ffff11005dda786 R10: dffffc0000000000 R11: ffffed1005dda787 R12: dffffc0000000000 R13: 1ffff1100b406f8c R14: ffff88805a037c60 R15: ffff88805dc14b88 FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6e57cfc57c CR3: 000000005ded8000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> device_del+0x2c9/0x9b0 drivers/base/core.c:3838 unregister_netdevice_many_notify+0x1859/0x1da0 net/core/dev.c:11556 unregister_netdevice_many net/core/dev.c:11584 [inline] unregister_netdevice_queue+0x303/0x370 net/core/dev.c:11456 unregister_netdevice include/linux/netdevice.h:3192 [inline] unregister_netdev+0x1c/0x30 net/core/dev.c:11602 bnep_session+0x2e3c/0x3030 net/bluetooth/bnep/core.c:525 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:klist_put lib/klist.c:212 [inline] RIP: 0010:klist_del+0x49/0x110 lib/klist.c:230 Code: f5 4d 89 f5 49 c1 ed 03 43 80 7c 25 00 00 74 08 4c 89 f7 e8 f9 77 3d f6 49 8b 1e 48 83 e3 fe 48 8d 7b 58 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 05 e8 db 77 3d f6 4c 8b 7b 58 48 89 df e8 2f 99 RSP: 0000:ffffc9000b91f828 EFLAGS: 00010202 RAX: 000000000000000b RBX: 0000000000000000 RCX: ffff88807e749e00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000058 RBP: ffffc9000b91f950 R08: ffffffff823dd8ba R09: 1ffff11005dda786 R10: dffffc0000000000 R11: ffffed1005dda787 R12: dffffc0000000000 R13: 1ffff1100b406f8c R14: ffff88805a037c60 R15: ffff88805dc14b88 FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6e57cfc57c CR3: 0000000033700000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: f5 cmc 1: 4d 89 f5 mov %r14,%r13 4: 49 c1 ed 03 shr $0x3,%r13 8: 43 80 7c 25 00 00 cmpb $0x0,0x0(%r13,%r12,1) e: 74 08 je 0x18 10: 4c 89 f7 mov %r14,%rdi 13: e8 f9 77 3d f6 call 0xf63d7811 18: 49 8b 1e mov (%r14),%rbx 1b: 48 83 e3 fe and $0xfffffffffffffffe,%rbx 1f: 48 8d 7b 58 lea 0x58(%rbx),%rdi 23: 48 89 f8 mov %rdi,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction 2f: 74 05 je 0x36 31: e8 db 77 3d f6 call 0xf63d7811 36: 4c 8b 7b 58 mov 0x58(%rbx),%r15 3a: 48 89 df mov %rbx,%rdi 3d: e8 .byte 0xe8 3e: 2f (bad) 3f: 99 cltd --- 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 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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