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Message-ID: <67ff5d47.050a0220.5cdb3.0002.GAE@google.com> Date: Wed, 16 Apr 2025 00:33:27 -0700 From: syzbot <syzbot+ed60da8d686dc709164c@...kaller.appspotmail.com> To: davem@...emloft.net, edumazet@...gle.com, horms@...nel.org, jmaloy@...hat.com, kuba@...nel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com, tipc-discussion@...ts.sourceforge.net Subject: [syzbot] [tipc?] general protection fault in tipc_mon_reinit_self (3) Hello, syzbot found the following issue on: HEAD commit: 900241a5cc15 Merge tag 'drm-fixes-2025-04-11-1' of https:/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16128870580000 kernel config: https://syzkaller.appspot.com/x/.config?x=7a4e108575159039 dashboard link: https://syzkaller.appspot.com/bug?extid=ed60da8d686dc709164c compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-900241a5.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/792caadc5fb3/vmlinux-900241a5.xz kernel image: https://storage.googleapis.com/syzbot-assets/c386404e8ac9/bzImage-900241a5.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ed60da8d686dc709164c@...kaller.appspotmail.com tipc: Node number set to 1055423674 Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 3 UID: 0 PID: 6017 Comm: kworker/3:5 Not tainted 6.15.0-rc1-syzkaller-00246-g900241a5cc15 #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Workqueue: events tipc_net_finalize_work RIP: 0010:tipc_mon_reinit_self+0x11c/0x210 net/tipc/monitor.c:719 Code: 8b 54 24 08 48 8d 78 10 48 89 f9 48 c1 e9 03 0f b6 0c 29 84 c9 74 09 80 f9 03 0f 8e b2 00 00 00 8b 48 10 48 89 d0 48 c1 e8 03 <0f> b6 04 28 84 c0 74 04 3c 03 7e 7d 89 0a 4c 89 ff e8 ce c1 65 00 RSP: 0018:ffffc9000356fb68 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000003ee87cba RDX: 0000000000000000 RSI: ffffffff8dbc56a7 RDI: ffff88804c2cc010 RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000007 R13: fffffbfff2111097 R14: ffff88804ead8000 R15: ffff88804ead9010 FS: 0000000000000000(0000) GS:ffff888097ab9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000f720eb00 CR3: 000000000e182000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> tipc_net_finalize+0x10b/0x180 net/tipc/net.c:140 process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400 kthread+0x3c2/0x780 kernel/kthread.c:464 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:tipc_mon_reinit_self+0x11c/0x210 net/tipc/monitor.c:719 Code: 8b 54 24 08 48 8d 78 10 48 89 f9 48 c1 e9 03 0f b6 0c 29 84 c9 74 09 80 f9 03 0f 8e b2 00 00 00 8b 48 10 48 89 d0 48 c1 e8 03 <0f> b6 04 28 84 c0 74 04 3c 03 7e 7d 89 0a 4c 89 ff e8 ce c1 65 00 RSP: 0018:ffffc9000356fb68 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000003ee87cba RDX: 0000000000000000 RSI: ffffffff8dbc56a7 RDI: ffff88804c2cc010 RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000007 R13: fffffbfff2111097 R14: ffff88804ead8000 R15: ffff88804ead9010 FS: 0000000000000000(0000) GS:ffff888097ab9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000f720eb00 CR3: 000000000e182000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 8b 54 24 08 mov 0x8(%rsp),%edx 4: 48 8d 78 10 lea 0x10(%rax),%rdi 8: 48 89 f9 mov %rdi,%rcx b: 48 c1 e9 03 shr $0x3,%rcx f: 0f b6 0c 29 movzbl (%rcx,%rbp,1),%ecx 13: 84 c9 test %cl,%cl 15: 74 09 je 0x20 17: 80 f9 03 cmp $0x3,%cl 1a: 0f 8e b2 00 00 00 jle 0xd2 20: 8b 48 10 mov 0x10(%rax),%ecx 23: 48 89 d0 mov %rdx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 0f b6 04 28 movzbl (%rax,%rbp,1),%eax <-- trapping instruction 2e: 84 c0 test %al,%al 30: 74 04 je 0x36 32: 3c 03 cmp $0x3,%al 34: 7e 7d jle 0xb3 36: 89 0a mov %ecx,(%rdx) 38: 4c 89 ff mov %r15,%rdi 3b: e8 ce c1 65 00 call 0x65c20e --- 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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