Hello, syzbot found the following issue on: HEAD commit: 4fafd96910ad Add linux-next specific files for 20230203 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=16b014c5480000 kernel config: https://syzkaller.appspot.com/x/.config?x=1d2fba7d42502ca4 dashboard link: https://syzkaller.appspot.com/bug?extid=6b1a2e744e37db9f50b3 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=127247a5480000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10cd186d480000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/348cc2da441a/disk-4fafd969.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e2dedc500f12/vmlinux-4fafd969.xz kernel image: https://storage.googleapis.com/syzbot-assets/fae710d9ebd8/bzImage-4fafd969.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/fbee878c2283/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6b1a2e744e37db9f50b3@xxxxxxxxxxxxxxxxxxxxxxxxx sshd[5074]: segfault at 200000001 ip 0000000200000001 sp 00007ffed2745410 error 14 in sshd[563ab7bc0000+b000] likely on CPU 0 (core 0, socket 0) Code: Unable to access opcode bytes at 0x1ffffffd7. list_del corruption. prev->next should be ffff88807a4b71e8, but was 0000000200000001. (prev=ffff8880761b16c8) ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:59! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 5074 Comm: sshd Not tainted 6.2.0-rc6-next-20230203-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 RIP: 0010:__list_del_entry_valid+0x11f/0x1b0 lib/list_debug.c:59 Code: 07 a7 8a e8 f3 09 4b fd 0f 0b 48 89 ca 48 c7 c7 e0 07 a7 8a e8 e2 09 4b fd 0f 0b 4c 89 c2 48 c7 c7 40 08 a7 8a e8 d1 09 4b fd <0f> 0b 48 89 d1 48 c7 c7 c0 08 a7 8a 4c 89 c2 e8 bd 09 4b fd 0f 0b RSP: 0018:ffffc90003bbfaf8 EFLAGS: 00010086 RAX: 000000000000006d RBX: ffff88807a4b71a0 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8168dfbc RDI: 0000000000000005 RBP: ffff88807a4b71a0 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000080000001 R11: 0000000000000000 R12: 0000000000000292 R13: ffff88807a4b71e8 R14: ffff88807a4b71f0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000040048 CR3: 0000000027e6d000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> __list_del_entry include/linux/list.h:134 [inline] list_del include/linux/list.h:148 [inline] percpu_counter_destroy.part.0+0x4f/0x200 lib/percpu_counter.c:198 percpu_counter_destroy+0x3c/0x50 lib/percpu_counter.c:191 __mmdrop+0x294/0x470 kernel/fork.c:800 mmdrop include/linux/sched/mm.h:50 [inline] __mmput+0x3fd/0x4c0 kernel/fork.c:1220 mmput+0x60/0x70 kernel/fork.c:1231 exit_mm kernel/exit.c:563 [inline] do_exit+0x9d7/0x2b60 kernel/exit.c:856 do_group_exit+0xd4/0x2a0 kernel/exit.c:1019 get_signal+0x2321/0x25b0 kernel/signal.c:2859 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204 irqentry_exit_to_user_mode+0x9/0x40 kernel/entry/common.c:310 exc_page_fault+0xc0/0x170 arch/x86/mm/fault.c:1557 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0033:0x200000001 Code: Unable to access opcode bytes at 0x1ffffffd7. RSP: 002b:00007ffed2745410 EFLAGS: 00010202 RAX: 00000000ffffffff RBX: 0000000200000001 RCX: 00007fec0d6ead83 RDX: fffffffffffffea0 RSI: 0000563ab9bf6f40 RDI: 000000000000000a RBP: 0000000000040048 R08: 00007ffed27453d0 R09: 00007ffed27453e0 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 R13: 0000000000000001 R14: 00007ffed2745458 R15: 00007ffed27454d8 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__list_del_entry_valid+0x11f/0x1b0 lib/list_debug.c:59 Code: 07 a7 8a e8 f3 09 4b fd 0f 0b 48 89 ca 48 c7 c7 e0 07 a7 8a e8 e2 09 4b fd 0f 0b 4c 89 c2 48 c7 c7 40 08 a7 8a e8 d1 09 4b fd <0f> 0b 48 89 d1 48 c7 c7 c0 08 a7 8a 4c 89 c2 e8 bd 09 4b fd 0f 0b RSP: 0018:ffffc90003bbfaf8 EFLAGS: 00010086 RAX: 000000000000006d RBX: ffff88807a4b71a0 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8168dfbc RDI: 0000000000000005 RBP: ffff88807a4b71a0 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000080000001 R11: 0000000000000000 R12: 0000000000000292 R13: ffff88807a4b71e8 R14: ffff88807a4b71f0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000040048 CR3: 0000000027e6d000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- 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@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
