[linus:master] [kobject] 1b28cb81da: canonical_address#:#[##]

From: kernel test robot
Date: Wed Feb 07 2024 - 01:43:12 EST



Hello,

kernel test robot noticed "canonical_address#:#[##]" on:

commit: 1b28cb81dab7c1eedc6034206f4e8d644046ad31 ("kobject: Remove redundant checks for whether ktype is NULL")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master

[test failed on linus/master 54be6c6c5ae8e0d93a6c4641cb7528eb0b6ba478 (v6.8-rc3)]
[test failed on linux-next/master 076d56d74f17e625b3d63cf4743b3d7d02180379]

in testcase: boot

compiler: gcc-11
test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G

(please refer to attached dmesg/kmsg for entire log/backtrace)



we noticed this issue is very random, as below, observed 4 times out of 68 runs.
but we didn't see in on parent.

meanwhile, we noticed there is another random issue on parent, the dmesg is
attached as dmesg-4d0fe8c52b.xz. we didn't see this issue on 1b28cb81da. FYI
(the dmesg for 1b28cb81da is uploaded to [1])

4d0fe8c52bb3029d 1b28cb81dab7c1eedc6034206f4
---------------- ---------------------------
fail:runs %reproduction fail:runs
| | |
:68 6% 4:68 dmesg.Kernel_panic-not_syncing:Fatal_exception
:68 6% 4:68 dmesg.RIP:__kobject_del
5:68 -7% :68 dmesg.RIP:kobject_put
5:68 -7% :68 dmesg.RIP:refcount_warn_saturate
5:68 -7% :68 dmesg.WARNING:at_lib/kobject.c:#kobject_put
5:68 -7% :68 dmesg.WARNING:at_lib/refcount.c:#refcount_warn_saturate
:68 6% 4:68 dmesg.canonical_address#:#[##]



If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <oliver.sang@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-lkp/202402071403.e302e33a-oliver.sang@xxxxxxxxx



[ 75.238491][ T1] IRQ13 -> 0:13
[ 75.238931][ T1] IRQ14 -> 0:14
[ 75.239377][ T1] IRQ15 -> 0:15
[ 75.239833][ T1] .................................... done.
[ 75.342389][ T1] sched_clock: Marking stable (75300013917, 40623244)->(75406217264, -65580103)
[ 84.458843][ T6] general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN
[ 84.459548][ T1] kmemleak: Kernel memory leak detector initialized (mem pool available: 13821)
[ 84.460356][ T6] KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
[ 84.460364][ T6] CPU: 0 PID: 6 Comm: kworker/0:0 Tainted: G N 6.5.0-rc4-00030-g1b28cb81dab7 #1
[ 84.463835][ T6] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[ 84.464399][ T61] kmemleak: Automatic memory scanning thread started
[ 84.465113][ T6] Workqueue: events slab_caches_to_rcu_destroy_workfn
[ 84.465127][ T6] RIP: 0010:__kobject_del (kbuild/src/consumer/lib/kobject.c:592)
[ 84.465137][ T6] Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 23 02 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 6b 28 48 8d 7d 10 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 f6 01 00 00 48 8b 75 10 48 89 df 48 8d 6b 3c e8
All code
========
0: 48 89 fa mov %rdi,%rdx
3: 48 c1 ea 03 shr $0x3,%rdx
7: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
b: 0f 85 23 02 00 00 jne 0x234
11: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
18: fc ff df
1b: 48 8b 6b 28 mov 0x28(%rbx),%rbp
1f: 48 8d 7d 10 lea 0x10(%rbp),%rdi
23: 48 89 fa mov %rdi,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
2a:* 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction
2e: 0f 85 f6 01 00 00 jne 0x22a
34: 48 8b 75 10 mov 0x10(%rbp),%rsi
38: 48 89 df mov %rbx,%rdi
3b: 48 8d 6b 3c lea 0x3c(%rbx),%rbp
3f: e8 .byte 0xe8

Code starting with the faulting instruction
===========================================
0: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
4: 0f 85 f6 01 00 00 jne 0x200
a: 48 8b 75 10 mov 0x10(%rbp),%rsi
e: 48 89 df mov %rbx,%rdi
11: 48 8d 6b 3c lea 0x3c(%rbx),%rbp
15: e8 .byte 0xe8
[ 84.469942][ T6] RSP: 0000:ffffc9000006fcb0 EFLAGS: 00010202
[ 84.470698][ T6] RAX: dffffc0000000000 RBX: ffff888129354838 RCX: 0000000000000000
[ 84.471694][ T6] RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000010
[ 84.472675][ T6] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
[ 84.473661][ T6] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[ 84.474651][ T6] R13: ffffc9000006fdb8 R14: ffff8881002c2ea8 R15: ffffffff83ac74c0
[ 84.475621][ T6] FS: 0000000000000000(0000) GS:ffff8883aee00000(0000) knlGS:0000000000000000
[ 84.476712][ T6] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 84.477516][ T6] CR2: ffff88843ffff000 CR3: 0000000003435000 CR4: 00000000000406b0
[ 84.478471][ T6] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 84.479449][ T6] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 84.480436][ T6] Call Trace:
[ 84.480849][ T6] <TASK>
[ 84.481216][ T6] ? die_addr (kbuild/src/consumer/arch/x86/kernel/dumpstack.c:421 kbuild/src/consumer/arch/x86/kernel/dumpstack.c:460)
[ 84.481738][ T6] ? exc_general_protection (kbuild/src/consumer/arch/x86/kernel/traps.c:787 kbuild/src/consumer/arch/x86/kernel/traps.c:729)
[ 84.482409][ T6] ? asm_exc_general_protection (kbuild/src/consumer/arch/x86/include/asm/idtentry.h:564)
[ 84.483127][ T6] ? __kobject_del (kbuild/src/consumer/lib/kobject.c:592)


[1]
The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20240207/202402071403.e302e33a-oliver.sang@xxxxxxxxx



--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

Attachment: dmesg-4d0fe8c52b.xz
Description: application/xz