syzbot has found a reproducer for the following issue on: HEAD commit: 40b8e93e17bf Add linux-next specific files for 20250204 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=113d5d18580000 kernel config: https://syzkaller.appspot.com/x/.config?x=ec880188a87c6aad dashboard link: https://syzkaller.appspot.com/bug?extid=683f8cb11b94b1824c77 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=10b7eeb0580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12f74f64580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/ccdfef06f59f/disk-40b8e93e.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/b339eaf8dcfd/vmlinux-40b8e93e.xz kernel image: https://storage.googleapis.com/syzbot-assets/ae1a0f1c3c80/bzImage-40b8e93e.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+683f8cb11b94b1824c77@xxxxxxxxxxxxxxxxxxxxxxxxx Oops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 0 UID: 0 PID: 5833 Comm: syz-executor346 Not tainted 6.14.0-rc1-next-20250204-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 RIP: 0010:skb_queue_empty_lockless include/linux/skbuff.h:1887 [inline] RIP: 0010:skb_queue_purge_reason+0xaa/0x500 net/core/skbuff.c:3936 Code: 89 44 24 78 42 c6 44 30 13 f3 e8 81 76 05 f8 48 8d bc 24 b0 00 00 00 ba 48 00 00 00 31 f6 e8 0d f2 6b f8 4d 89 ef 49 c1 ef 03 <43> 80 3c 37 00 74 08 4c 89 ef e8 27 ef 6b f8 49 8b 45 00 4c 39 e8 RSP: 0018:ffffc90003d17880 EFLAGS: 00010202 RAX: ffffc90003d17930 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc90003d17978 RBP: ffffc90003d179f0 R08: ffffc90003d17977 R09: 0000000000000000 R10: ffffc90003d17930 R11: fffff520007a2f2f R12: dffffc0000000000 R13: 0000000000000008 R14: dffffc0000000000 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055867393d608 CR3: 000000000e738000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> skb_queue_purge include/linux/skbuff.h:3364 [inline] mrvl_close+0x8e/0x120 drivers/bluetooth/hci_mrvl.c:100 hci_uart_tty_close+0x205/0x290 drivers/bluetooth/hci_ldisc.c:557 tty_ldisc_kill+0xa3/0x1a0 drivers/tty/tty_ldisc.c:613 tty_ldisc_release+0x1a1/0x200 drivers/tty/tty_ldisc.c:781 tty_release_struct+0x2b/0xe0 drivers/tty/tty_io.c:1690 tty_release+0xd06/0x12c0 drivers/tty/tty_io.c:1861 __fput+0x3e9/0x9f0 fs/file_table.c:448 task_work_run+0x24f/0x310 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0xa2a/0x28e0 kernel/exit.c:938 do_group_exit+0x207/0x2c0 kernel/exit.c:1087 __do_sys_exit_group kernel/exit.c:1098 [inline] __se_sys_exit_group kernel/exit.c:1096 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1096 x64_sys_call+0x26a8/0x26b0 arch/x86/include/generated/asm/syscalls_64.h:232 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: 0033:0x7f794f6cfc79 Code: Unable to access opcode bytes at 0x7f794f6cfc4f. RSP: 002b:00007fff04322488 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f794f6cfc79 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 RBP: 00007f794f74a270 R08: ffffffffffffffb8 R09: 00007fff043226a8 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f794f74a270 R13: 0000000000000000 R14: 00007f794f74acc0 R15: 00007f794f6a1a60 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:skb_queue_empty_lockless include/linux/skbuff.h:1887 [inline] RIP: 0010:skb_queue_purge_reason+0xaa/0x500 net/core/skbuff.c:3936 Code: 89 44 24 78 42 c6 44 30 13 f3 e8 81 76 05 f8 48 8d bc 24 b0 00 00 00 ba 48 00 00 00 31 f6 e8 0d f2 6b f8 4d 89 ef 49 c1 ef 03 <43> 80 3c 37 00 74 08 4c 89 ef e8 27 ef 6b f8 49 8b 45 00 4c 39 e8 RSP: 0018:ffffc90003d17880 EFLAGS: 00010202 RAX: ffffc90003d17930 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc90003d17978 RBP: ffffc90003d179f0 R08: ffffc90003d17977 R09: 0000000000000000 R10: ffffc90003d17930 R11: fffff520007a2f2f R12: dffffc0000000000 R13: 0000000000000008 R14: dffffc0000000000 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055867393d608 CR3: 000000000e738000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 89 44 24 78 mov %eax,0x78(%rsp) 4: 42 c6 44 30 13 f3 movb $0xf3,0x13(%rax,%r14,1) a: e8 81 76 05 f8 call 0xf8057690 f: 48 8d bc 24 b0 00 00 lea 0xb0(%rsp),%rdi 16: 00 17: ba 48 00 00 00 mov $0x48,%edx 1c: 31 f6 xor %esi,%esi 1e: e8 0d f2 6b f8 call 0xf86bf230 23: 4d 89 ef mov %r13,%r15 26: 49 c1 ef 03 shr $0x3,%r15 * 2a: 43 80 3c 37 00 cmpb $0x0,(%r15,%r14,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 ef mov %r13,%rdi 34: e8 27 ef 6b f8 call 0xf86bef60 39: 49 8b 45 00 mov 0x0(%r13),%rax 3d: 4c 39 e8 cmp %r13,%rax --- 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.
