[Bug][Git-Bisect][6.11.0-next-20240917]BUG: Unable to handle kernel data access on read at 0xc00c020000013d88

[Venkat Rao Bagalkote]

Greetings!!!


I am observing Kernel OOPs on PowerPC system, while running LTP Test case.

Below is the Traces:

[11472.962838] BUG: Unable to handle kernel data access on read at 
0xc00c020000013d88
[11472.962846] Faulting instruction address: 0xc00000000055e2c0
[11472.962851] Oops: Kernel access of bad area, sig: 11 [#1]
[11472.962854] LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=8192 NUMA pSeries
[11472.962860] Modules linked in: zram torture dummy veth dns_resolver 
tun brd overlay exfat vfat fat btrfs blake2b_generic xor raid6_pq 
zstd_compress xfs loop sctp ip6_udp_tunnel udp_tunnel nft_fib_inet 
nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 
nf_reject_ipv6 nft_reject nft_ct nft_chain_nat nf_nat nf_conntrack 
bonding nf_defrag_ipv6 nf_defrag_ipv4 tls rfkill ip_set nf_tables 
libcrc32c nfnetlink kmem device_dax pseries_rng vmx_crypto dax_pmem fuse 
ext4 mbcache jbd2 sd_mod sg nd_pmem nd_btt papr_scm ibmvscsi 
scsi_transport_srp ibmveth libnvdimm [last unloaded: zram]
[11472.962920] CPU: 26 UID: 0 PID: 769950 Comm: zram03 Kdump: loaded 
Tainted: G   M       O       6.11.0-next-20240917 #1
[11472.962927] Tainted: [M]=MACHINE_CHECK, [O]=OOT_MODULE
[11472.962930] Hardware name: IBM,9080-HEX Power11 (architected) 
0x820200 0xf000007 of:IBM,FW1110.00 (NH1110_009) hv:phyp pSeries
[11472.962935] NIP:  c00000000055e2c0 LR: c008000004e02838 CTR: 
c00000000055e260
[11472.962940] REGS: c0000005da817890 TRAP: 0300   Tainted: G M       
O        (6.11.0-next-20240917)
[11472.962945] MSR:  800000000280b033 <SF,VEC,VSX,EE,FP,ME,IR,DR,RI,LE>  
CR: 48008284  XER: 00000002
[11472.962956] CFAR: c008000004e064cc DAR: c00c020000013d88 DSISR: 
40000000 IRQMASK: 0
[11472.962956] GPR00: c008000004e02838 c0000005da817b30 c000000001604400 
c008000004f602d0
[11472.962956] GPR04: 00000000c0000005 000000000011442d c0000005881791c0 
000000000011442c
[11472.962956] GPR08: 0000000ef9a00000 0000020000013d80 c000000002da75f0 
c008000004e064b8
[11472.962956] GPR12: c00000000055e260 c000000efde77f00 0000000000000000 
0000000000000000
[11472.962956] GPR16: 0000000000000000 0000000000000000 0000000000000000 
0000000000000000
[11472.962956] GPR20: 0000000000000000 0000000000000000 0000000000000000 
0000000000000000
[11472.962956] GPR24: 0000000000000000 0000000000000000 c00000051f580440 
c00000036fa15480
[11472.962956] GPR28: c008000004e02838 0000000000002000 c00c020000013d80 
c008000004f602d0
[11472.963005] NIP [c00000000055e2c0] kfree+0x60/0x468
[11472.963013] LR [c008000004e02838] zram_destroy_comps+0x5c/0xa4 [zram]
[11472.963020] Call Trace:
[11472.963023] [c0000005da817b30] [c00000051f580440] 0xc00000051f580440 
(unreliable)
[11472.963028] [c0000005da817ba0] [c008000004e02838] 
zram_destroy_comps+0x5c/0xa4 [zram]
[11472.963034] [c0000005da817bd0] [c008000004e02d24] 
zram_reset_device+0x178/0x250 [zram]
[11472.963040] [c0000005da817c20] [c008000004e031e0] 
reset_store+0xd0/0x174 [zram]
[11472.963046] [c0000005da817c80] [c000000000a85874] 
dev_attr_store+0x34/0x50
[11472.963052] [c0000005da817ca0] [c00000000070e7a4] 
sysfs_kf_write+0x64/0x78
[11472.963060] [c0000005da817cc0] [c00000000070d2a8] 
kernfs_fop_write_iter+0x1b0/0x290
[11472.963066] [c0000005da817d10] [c000000000604868] vfs_write+0x38c/0x488
[11472.963071] [c0000005da817dc0] [c000000000604c98] ksys_write+0x84/0x140
[11472.963076] [c0000005da817e10] [c000000000033558] 
system_call_exception+0x138/0x330
[11472.963083] [c0000005da817e50] [c00000000000d05c] 
system_call_vectored_common+0x15c/0x2ec
[11472.963090] --- interrupt: 3000 at 0x7fffa2133e74
[11472.963094] NIP:  00007fffa2133e74 LR: 00007fffa2133e74 CTR: 
0000000000000000
[11472.963098] REGS: c0000005da817e80 TRAP: 3000   Tainted: G M       
O        (6.11.0-next-20240917)
[11472.963103] MSR:  800000000280f033 
<SF,VEC,VSX,EE,PR,FP,ME,IR,DR,RI,LE>  CR: 44002484  XER: 00000000
[11472.963113] IRQMASK: 0
[11472.963113] GPR00: 0000000000000004 00007fffc66c6250 0000000010057f00 
0000000000000003
[11472.963113] GPR04: 000000002e730b90 0000000000000001 0000000000000000 
0000000000000001
[11472.963113] GPR08: 0000000000000000 0000000000000000 0000000000000000 
0000000000000000
[11472.963113] GPR12: 0000000000000000 00007fffa23ea5c0 0000000000000000 
0000000010033770
[11472.963113] GPR16: 0000000010033eb8 0000000010034548 000000001003454c 
0000000010033ee0
[11472.963113] GPR20: 0000000010033d10 00000000100343b8 0000000010032e70 
0000000000000000
[11472.963113] GPR24: 0000000010050838 000000001002e650 000000002e730b90 
0000000000000001
[11472.963113] GPR28: 0000000000000001 000000002e730370 000000002e730b90 
0000000000000001
[11472.963157] NIP [00007fffa2133e74] 0x7fffa2133e74
[11472.963160] LR [00007fffa2133e74] 0x7fffa2133e74
[11472.963163] --- interrupt: 3000
[11472.963166] Code: f9210028 39200000 60000000 283f0010 40810170 
fbc10060 3d22017a 394931f0 7be98502 79293664 ebca0000 7fde4a14 
<e93e0008> 3949ffff 71290001 7fde509e
[11472.963180] ---[ end trace 0000000000000000 ]---


Git Bisect is pointing to the below commit, as first bad commit.


Commit ID: 6a81bdfeb35094c3097650306a5fda9a990d8a97


Regards,

Venkat.