On 7/16/21 1:14 AM, syzbot wrote: > Hello, > > syzbot has tested the proposed patch but the reproducer is still triggering an issue: > WARNING in io_uring_cancel_generic attempt to get stats #2 #syz test: https://github.com/isilence/linux.git syztest_sqpoll_hang > > ------------[ cut here ]------------ > WARNING: CPU: 1 PID: 25279 at fs/io_uring.c:9122 io_dump fs/io_uring.c:9117 [inline] > WARNING: CPU: 1 PID: 25279 at fs/io_uring.c:9122 io_uring_cancel_generic+0x5fb/0xe50 fs/io_uring.c:9195 > Modules linked in: > CPU: 1 PID: 25279 Comm: iou-sqp-25271 Tainted: G W 5.14.0-rc1-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > RIP: 0010:io_dump fs/io_uring.c:9122 [inline] > RIP: 0010:io_uring_cancel_generic+0x5fb/0xe50 fs/io_uring.c:9195 > Code: 08 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 9e 06 00 00 48 8b 85 10 08 00 00 48 89 44 24 40 <0f> 0b 48 8b 44 24 10 48 05 98 00 00 00 48 89 c2 48 89 44 24 08 48 > RSP: 0018:ffffc9000ab87c50 EFLAGS: 00010246 > RAX: ffff88803ddb7800 RBX: ffff888049f73880 RCX: 0000000000000000 > RDX: 1ffff110093ee812 RSI: ffffffff81e2ebed RDI: ffff888049f74090 > RBP: ffff888049f73880 R08: 0000000000000000 R09: 0000000000000000 > R10: ffffffff81e2ebc5 R11: 0000000000000001 R12: ffffc9000ab87d40 > R13: ffff88803ddb7858 R14: 0000000000000001 R15: 0000000000000000 > FS: 00007fb893f40700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f68dd0c6080 CR3: 000000002b457000 CR4: 0000000000350ef0 > Call Trace: > io_sq_thread+0xaac/0x1250 fs/io_uring.c:6930 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 > Kernel panic - not syncing: panic_on_warn set ... > CPU: 1 PID: 25279 Comm: iou-sqp-25271 Tainted: G W 5.14.0-rc1-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:88 [inline] > dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105 > panic+0x306/0x73d kernel/panic.c:232 > __warn.cold+0x35/0x44 kernel/panic.c:606 > report_bug+0x1bd/0x210 lib/bug.c:199 > handle_bug+0x3c/0x60 arch/x86/kernel/traps.c:239 > exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:259 > asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:566 > RIP: 0010:io_dump fs/io_uring.c:9122 [inline] > RIP: 0010:io_uring_cancel_generic+0x5fb/0xe50 fs/io_uring.c:9195 > Code: 08 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 9e 06 00 00 48 8b 85 10 08 00 00 48 89 44 24 40 <0f> 0b 48 8b 44 24 10 48 05 98 00 00 00 48 89 c2 48 89 44 24 08 48 > RSP: 0018:ffffc9000ab87c50 EFLAGS: 00010246 > RAX: ffff88803ddb7800 RBX: ffff888049f73880 RCX: 0000000000000000 > RDX: 1ffff110093ee812 RSI: ffffffff81e2ebed RDI: ffff888049f74090 > RBP: ffff888049f73880 R08: 0000000000000000 R09: 0000000000000000 > R10: ffffffff81e2ebc5 R11: 0000000000000001 R12: ffffc9000ab87d40 > R13: ffff88803ddb7858 R14: 0000000000000001 R15: 0000000000000000 > io_sq_thread+0xaac/0x1250 fs/io_uring.c:6930 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 > Kernel Offset: disabled > Rebooting in 86400 seconds.. > > > Tested on: > > commit: d55b8f3c io_uring: add syz debug info > git tree: https://github.com/isilence/linux.git syztest_sqpoll_hang > console output: https://syzkaller.appspot.com/x/log.txt?x=16f6cb80300000 > kernel config: https://syzkaller.appspot.com/x/.config?x=cfe2c0e42bc9993d > dashboard link: https://syzkaller.appspot.com/bug?extid=ac957324022b7132accf > compiler: > -- Pavel Begunkov
