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Message-ID: <23112bc4-a498-4089-a225-1440c2151ce2@kernel.dk> Date: Mon, 9 Feb 2026 13:18:03 -0700 From: Jens Axboe <axboe@...nel.dk> To: syzbot <syzbot+ab12f0c08dd7ab8d057c@...kaller.appspotmail.com>, io-uring@...r.kernel.org, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com, Mauro Carvalho Chehab <mchehab@...nel.org>, linux-media@...r.kernel.org Subject: Re: [syzbot] [io-uring?] BUG: corrupted list in io_poll_remove_entries On 2/9/26 11:26 AM, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: e7aa57247700 Merge tag 'spi-fix-v6.19-rc8' of git://git.ke.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=14d3b65a580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=f1fac0919970b671 > dashboard link: https://syzkaller.appspot.com/bug?extid=ab12f0c08dd7ab8d057c > compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1222965a580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=140e833a580000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/c46beb4ff3a5/disk-e7aa5724.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/d162bcaaf9b9/vmlinux-e7aa5724.xz > kernel image: https://storage.googleapis.com/syzbot-assets/54b0844b8ea7/bzImage-e7aa5724.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+ab12f0c08dd7ab8d057c@...kaller.appspotmail.com > > list_del corruption. prev->next should be ffff88807dc6c3f0, but was ffff888146b205c8. (prev=ffff888146b205c8) > ------------[ cut here ]------------ > kernel BUG at lib/list_debug.c:62! > Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI > CPU: 0 UID: 0 PID: 5969 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 > RIP: 0010:__list_del_entry_valid_or_report+0x14a/0x1d0 lib/list_debug.c:62 > Code: 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 8d 00 00 00 48 8b 55 00 48 89 e9 48 89 de 48 c7 c7 40 3d fa 8b e8 37 b0 32 fc 90 <0f> 0b 4c 89 e7 e8 3c 24 5d fd 48 89 ea 48 b8 00 00 00 00 00 fc ff > RSP: 0018:ffffc90003bffaa8 EFLAGS: 00010082 > RAX: 000000000000006d RBX: ffff88807dc6c3f0 RCX: 0000000000000000 > RDX: 000000000000006d RSI: ffffffff81e5d6c9 RDI: fffff5200077ff46 > RBP: ffff888146b205c8 R08: 0000000000000005 R09: 0000000000000000 > R10: 0000000080000001 R11: 0000000000000000 R12: ffff88807dc6c2b0 > R13: ffff88807dc6c408 R14: ffff88807dc6c3f0 R15: ffff88807dc6c3c8 > FS: 0000000000000000(0000) GS:ffff8881245d9000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f60e56708c0 CR3: 000000006b065000 CR4: 00000000003526f0 > Call Trace: > <TASK> > __list_del_entry_valid include/linux/list.h:132 [inline] > __list_del_entry include/linux/list.h:223 [inline] > list_del_init include/linux/list.h:295 [inline] > io_poll_remove_waitq io_uring/poll.c:149 [inline] > io_poll_remove_entry io_uring/poll.c:166 [inline] > io_poll_remove_entries.part.0+0x156/0x7e0 io_uring/poll.c:197 > io_poll_remove_entries io_uring/poll.c:177 [inline] > io_poll_task_func+0x39e/0xe30 io_uring/poll.c:343 > io_handle_tw_list+0x194/0x580 io_uring/io_uring.c:1122 > tctx_task_work_run+0x57/0x2b0 io_uring/io_uring.c:1182 > tctx_task_work+0x7a/0xd0 io_uring/io_uring.c:1200 > task_work_run+0x150/0x240 kernel/task_work.c:233 > exit_task_work include/linux/task_work.h:40 [inline] > do_exit+0x829/0x2a30 kernel/exit.c:971 > do_group_exit+0xd5/0x2a0 kernel/exit.c:1112 > __do_sys_exit_group kernel/exit.c:1123 [inline] > __se_sys_exit_group kernel/exit.c:1121 [inline] > __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1121 > x64_sys_call+0x14fd/0x1510 arch/x86/include/generated/asm/syscalls_64.h:232 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7f60e579aeb9 > Code: Unable to access opcode bytes at 0x7f60e579ae8f. > RSP: 002b:00007ffc2d47ddf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 > RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f60e579aeb9 > RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000 > RBP: 0000000000000003 R08: 0000000000000000 R09: 00007f60e59e1280 > R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000 > R13: 00007f60e59e1280 R14: 0000000000000003 R15: 00007ffc2d47deb0 > </TASK> > Modules linked in: > ---[ end trace 0000000000000000 ]--- > RIP: 0010:__list_del_entry_valid_or_report+0x14a/0x1d0 lib/list_debug.c:62 > Code: 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 8d 00 00 00 48 8b 55 00 48 89 e9 48 89 de 48 c7 c7 40 3d fa 8b e8 37 b0 32 fc 90 <0f> 0b 4c 89 e7 e8 3c 24 5d fd 48 89 ea 48 b8 00 00 00 00 00 fc ff > RSP: 0018:ffffc90003bffaa8 EFLAGS: 00010082 > RAX: 000000000000006d RBX: ffff88807dc6c3f0 RCX: 0000000000000000 > RDX: 000000000000006d RSI: ffffffff81e5d6c9 RDI: fffff5200077ff46 > RBP: ffff888146b205c8 R08: 0000000000000005 R09: 0000000000000000 > R10: 0000000080000001 R11: 0000000000000000 R12: ffff88807dc6c2b0 > R13: ffff88807dc6c408 R14: ffff88807dc6c3f0 R15: ffff88807dc6c3c8 > FS: 0000000000000000(0000) GS:ffff8881245d9000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f60e56708c0 CR3: 000000006b065000 CR4: 00000000003526f0 #syz test diff --git a/drivers/media/dvb-core/dmxdev.c b/drivers/media/dvb-core/dmxdev.c index 8c6f5aafda1d..5cb46109d1ff 100644 --- a/drivers/media/dvb-core/dmxdev.c +++ b/drivers/media/dvb-core/dmxdev.c @@ -168,7 +168,9 @@ static int dvb_dvr_open(struct inode *inode, struct file *file) mutex_unlock(&dmxdev->mutex); return -ENOMEM; } - dvb_ringbuffer_init(&dmxdev->dvr_buffer, mem, DVR_BUFFER_SIZE); + dmxdev->dvr_buffer.data = mem; + dmxdev->dvr_buffer.size = DVR_BUFFER_SIZE; + dvb_ringbuffer_reset(&dmxdev->dvr_buffer); if (dmxdev->may_do_mmap) dvb_vb2_init(&dmxdev->dvr_vb2_ctx, "dvr", file->f_flags & O_NONBLOCK); -- Jens Axboe
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