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format=flowed Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: NmLre71nuBKqpkRRyNXeHHYzCJKbKSmm X-Proofpoint-GUID: Pt44Bp16xx9yccZZJROR44K9cdhvcQyb X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNTA3MDA3OSBTYWx0ZWRfX81a4ZT0S0PSv Y4t5UQCBOS8r2qqMKE8Qs1NHtmIh9wDvryUx+jH5qh/cLrUZVyzsaIilvUNcgpqB4wthqQmFbpO Qri+cJ8rvHbR24Tbl//90Ta/6OJs7/JStVhKY5D9FDT4/cIe76OVkyyVHWFTpybHXG3/JVVlytp vkjWT/gZItBIWXlTrYtS9+/EOO0dea6aw5hXhf/mDJ9fZjfoY4TOOuq4RpS4tH2l+S6prejTn3k thAsGFW6sElBZeyGzJpn3WcXB50FCTG7Z6F/qSMj+6NnyxXG+jnNYzVrs1ZiuUzmKnIasHP3fQP GFoXiUrzA6G/mq/+HJs3E+ap0MvestszpHmmHlShxKI0sy7hTM/AM5/TkaBAWorwgxpVhmXJ5mc itrdAxMFGIPbDWTf2YIRpyyntLq6SWZegrJHxsyKRDSgFEDlR9xJl9wG3iZu2e39dXXX3xF9 X-Authority-Analysis: v=2.4 cv=FJcbx/os c=1 sm=1 tr=0 ts=681b1d78 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=IkcTkHD0fZMA:10 a=dt9VzEwgFbYA:10 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=UIzWbI13G1sJYqkSAR8A:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.0.736,FMLib:17.12.80.40 definitions=2025-05-07_03,2025-05-06_01,2025-02-21_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 mlxlogscore=812 phishscore=0 impostorscore=0 suspectscore=0 mlxscore=0 malwarescore=0 lowpriorityscore=0 clxscore=1015 bulkscore=0 adultscore=0 spamscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2504070000 definitions=main-2505070079 Hello, I am observing kernel OOPS, while running btrfs/001 TC, from xfstests suite. This issue is introduced in next-20250506. This issue is not seen on next-20250505 kernel. Steps to repro: 1. git clone git://git.kernel.org/pub/scm/fs/xfs/xfstests-dev.git 2. cd xfstests-dev/ 3. mkdir /mnt/loop-device /mnt/test /mnt/scratch 4. for i in $(seq 0 5); do fallocate -o 0 -l 5GiB /mnt/loop-device/file-$i.img; done 5. for i in $(seq 0 5); do losetup /dev/loop$i /mnt/loop-device/file-$i.img; done 6. mkfs.btrfs -f -s 65536 -n 65536 /dev/loop0; mkfs.btrfs -f /dev/loop1; mkfs.btrfs -f /dev/loop2; mkfs.btrfs -f /dev/loop3; mkfs.btrfs -f /dev/loop4; mkfs.btrfs -f /dev/loop5 8. vi local.config 9. make 10. ./check tools/btrfs/001 local.config contents: export RECREATE_TEST_DEV=true export TEST_DEV=/dev/loop0 export TEST_DIR=/mnt/test export SCRATCH_DEV_POOL="/dev/loop1 /dev/loop2 /dev/loop3 /dev/loop4 /dev/loop5" export SCRATCH_MNT=/mnt/scratch export MKFS_OPTIONS="-f -s 4096 -n 4096" export FSTYP=btrfs export MOUNT_OPTIONS="" Crash: [  953.799060] Btrfs loaded, zoned=yes, fsverity=no [  968.070858] BTRFS: device fsid 3813dc53-a2f3-4342-b44e-c9349f17f991 devid 1 transid 8 /dev/loop0 (7:0) scanned by mount (25422) [  968.072561] BTRFS info (device loop0): first mount of filesystem 3813dc53-a2f3-4342-b44e-c9349f17f991 [  968.072584] BTRFS info (device loop0): using crc32c (crc32c-powerpc) checksum algorithm [  968.072594] BTRFS info (device loop0): forcing free space tree for sector size 4096 with page size 65536 [  968.072599] BTRFS info (device loop0): using free-space-tree [  968.073867] BTRFS info (device loop0): checking UUID tree [  968.074000] Kernel attempted to read user page (68) - exploit attempt? (uid: 0) [  968.074009] BUG: Kernel NULL pointer dereference on read at 0x00000068 [  968.074013] Faulting instruction address: 0xc00800000f7fb5e0 [  968.074019] Oops: Kernel access of bad area, sig: 11 [#1] [  968.074022] LE PAGE_SIZE=64K MMU=Radix  SMP NR_CPUS=8192 NUMA pSeries [  968.074028] Modules linked in: btrfs blake2b_generic xor raid6_pq zstd_compress loop dm_mod nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct sunrpc nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 bonding tls rfkill ip_set nf_tables nfnetlink pseries_rng vmx_crypto fuse ext4 crc16 mbcache jbd2 sd_mod sg ibmvscsi scsi_transport_srp ibmveth [  968.074074] CPU: 0 UID: 0 PID: 25422 Comm: mount Kdump: loaded Not tainted 6.15.0-rc5-next-20250506 #1 VOLUNTARY [  968.074087] NIP:  c00800000f7fb5e0 LR: c00800000f7fb3b4 CTR: c00000000047862c [  968.074091] REGS: c000000154747920 TRAP: 0300   Not tainted (6.15.0-rc5-next-20250506) [  968.074096] MSR:  800000000280b033   CR: 24022882  XER: 00000000 [  968.074109] CFAR: c00800000f7fb650 DAR: 0000000000000068 DSISR: 40000000 IRQMASK: 0 [  968.074109] GPR00: c00800000f7fb3b4 c000000154747bc0 c0080000099da600 0000000000000000 [  968.074109] GPR04: c000000008570c20 7fffffffffffffff 0000000000000000 c0000000068e3a00 [  968.074109] GPR08: 0000000000000000 0000000000000000 c0000000068e3a00 0000000000002000 [  968.074109] GPR12: c00000000047862c c000000003020000 0000000000000000 0000000000000000 [  968.074109] GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [  968.074109] GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [  968.074109] GPR24: 0000000000000000 c000000015b00000 c00000007a38ac00 0000000000000020 [  968.074109] GPR28: c000000008560a00 c00000006b1784c0 0000000000000000 c000000063147980 [  968.074163] NIP [c00800000f7fb5e0] btrfs_get_tree_subvol+0x32c/0x544 [btrfs] [  968.074205] LR [c00800000f7fb3b4] btrfs_get_tree_subvol+0x100/0x544 [btrfs] [  968.074241] Call Trace: [  968.074244] [c000000154747bc0] [c00800000f7fb3b4] btrfs_get_tree_subvol+0x100/0x544 [btrfs] (unreliable) [  968.074282] [c000000154747cb0] [c000000000630da4] vfs_get_tree+0x48/0x15c [  968.074291] [c000000154747d30] [c00000000067675c] do_new_mount+0x234/0x438 [  968.074297] [c000000154747da0] [c000000000678298] sys_mount+0x164/0x1b0 [  968.074303] [c000000154747e10] [c000000000033338] system_call_exception+0x138/0x330 [  968.074311] [c000000154747e50] [c00000000000d05c] system_call_vectored_common+0x15c/0x2ec [  968.074319] ---- interrupt: 3000 at 0x7fff89d4edf4 [  968.074323] NIP:  00007fff89d4edf4 LR: 00007fff89d4edf4 CTR: 0000000000000000 [  968.074328] REGS: c000000154747e80 TRAP: 3000   Not tainted (6.15.0-rc5-next-20250506) [  968.074333] MSR:  800000000280f033   CR: 44022804  XER: 00000000 [  968.074345] IRQMASK: 0 [  968.074345] GPR00: 0000000000000015 00007fffc25e41b0 00007fff89e37d00 000000015e810710 [  968.074345] GPR04: 000000015e810730 000000015e8106f0 0000000000000000 000000015e810690 [  968.074345] GPR08: 000000015e8106f0 0000000000000000 0000000000000000 0000000000000000 [  968.074345] GPR12: 0000000000000000 00007fff8a03c140 0000000000000000 0000000000000000 [  968.074345] GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000125d1f298 [  968.074345] GPR20: 0000000000000000 0000000000000000 000000015e810530 000000015e810730 [  968.074345] GPR24: 00007fff89f38e68 00007fff89f38e78 00007fff89f3dfe8 00007fff89f60240 [  968.074345] GPR28: 000000015e8106f0 0000000000000000 000000015e810710 0000000000100000 [  968.074396] NIP [00007fff89d4edf4] 0x7fff89d4edf4 [  968.074399] LR [00007fff89d4edf4] 0x7fff89d4edf4 [  968.074403] ---- interrupt: 3000 [  968.074406] Code: 4bffeffd 3920f000 7c234840 7c7e1b78 41810144 7c7a1b78 4bfffe30 60000000 813f0088 71290001 41820068 e93d0040 38630070 481416e1 e8410018 [  968.074425] ---[ end trace 0000000000000000 ]--- [  968.076694] pstore: backend (nvram) writing error (-1) [  968.076698] If you happent to fix this, please add below tag. Reported-by: Venkat Rao Bagalkote Regards, Venkat.