Re: WARNING in idr_get_next

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in idr_get_next

------------[ cut here ]------------
WARNING: CPU: 0 PID: 8294 at lib/idr.c:269 idr_get_next+0x33a/0x3a0 lib/idr.c:269
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 8294 Comm: syz-executor.3 Not tainted 5.9.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1d6/0x29e lib/dump_stack.c:118
panic+0x2c0/0x800 kernel/panic.c:231
__warn+0x227/0x250 kernel/panic.c:600
report_bug+0x1b1/0x2e0 lib/bug.c:198
handle_bug+0x42/0x80 arch/x86/kernel/traps.c:234
exc_invalid_op+0x16/0x40 arch/x86/kernel/traps.c:254
asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536
RIP: 0010:idr_get_next+0x33a/0x3a0 lib/idr.c:269
Code: 6b 89 2b 65 48 8b 04 25 28 00 00 00 48 3b 44 24 58 75 72 4c 89 f8 48 83 c4 60 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 a6 54 b7 fd <0f> 0b 45 31 ff eb d2 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c f7 fc
RSP: 0018:ffffc90009e47d40 EFLAGS: 00010293
RAX: ffffffff83bda8ea RBX: ffffc90009e47de4 RCX: ffff888091674240
RDX: 0000000000000000 RSI: 00000000fffffffc RDI: 000000007fffffff
RBP: 00000000fffffffc R08: ffffffff83bda8a6 R09: fffffbfff13115b8
R10: fffffbfff13115b8 R11: 0000000000000000 R12: dffffc0000000000
R13: 1ffff920013c8faf R14: ffff8880850e64c8 R15: ffff8880a96110c0
qrtr_reset_ports net/qrtr/qrtr.c:734 [inline]
__qrtr_bind+0x58a/0x7d0 net/qrtr/qrtr.c:777
qrtr_bind+0x115/0x1a0 net/qrtr/qrtr.c:813
__sys_bind+0x283/0x360 net/socket.c:1656
__do_sys_bind net/socket.c:1667 [inline]
__se_sys_bind net/socket.c:1665 [inline]
__x64_sys_bind+0x76/0x80 net/socket.c:1665
do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45d5b9
Code: 5d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f0c9d816c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000031
RAX: ffffffffffffffda RBX: 0000000000001040 RCX: 000000000045d5b9
RDX: 000000000000000c RSI: 0000000020000140 RDI: 0000000000000003
RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c
R13: 00007ffd3a835e4f R14: 00007f0c9d8179c0 R15: 000000000118cf4c
Kernel Offset: disabled
Rebooting in 86400 seconds..


Tested on:

commit: ef2e9a56 Merge tag 'seccomp-v5.9-rc5' of git://git.kernel...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16852c11900000
kernel config: https://syzkaller.appspot.com/x/.config?x=8f5c353182ed6199
dashboard link: https://syzkaller.appspot.com/bug?extid=f7204dcf3df4bb4ce42c
compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)

[Anmol Karn]

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-and-tested-by: syzbot+f7204d...@syzkaller.appspotmail.com

Tested on:

commit: 856deb86 Linux 5.9-rc5
git tree: upstream
kernel config: https://syzkaller.appspot.com/x/.config?x=8c5366e0d4451457

dashboard link: https://syzkaller.appspot.com/bug?extid=f7204dcf3df4bb4ce42c
compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)

patch: https://syzkaller.appspot.com/x/patch.diff?x=11e45263900000

Note: testing is done by a robot and is best-effort only.