Greeting, FYI, we noticed the following commit (built with gcc-9): commit: c055908abe0d7f6a5bd4f602d0c825ae20daefc8 ("[RFC PATCH 33/39] blktrace: add blkext tracer") url: https://github.com/0day-ci/linux/commits/Chaitanya-Kulkarni/blktrace-add-block-trace-extension-support/20210225-151637 base: https://git.kernel.org/cgit/linux/kernel/git/axboe/linux-block.git for-next in testcase: trinity version: trinity-static-i386-x86_64-f93256fb_2019-08-28 with following parameters: runtime: 300s test-description: Trinity is a linux system call fuzz tester. test-url: http://codemonkey.org.uk/projects/trinity/ on test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 8G caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): +-------------------------------------------------------------------------+------------+------------+ | | 503e031aef | c055908abe | +-------------------------------------------------------------------------+------------+------------+ | WARNING:at_kernel/trace/trace.c:#create_trace_option_files | 0 | 5 | | EIP:create_trace_option_files | 0 | 5 | +-------------------------------------------------------------------------+------------+------------+ If you fix the issue, kindly add following tag Reported-by: kernel test robot [ 20.216017] WARNING: CPU: 0 PID: 1 at kernel/trace/trace.c:8370 create_trace_option_files (kbuild/src/consumer/kernel/trace/trace.c:8370 (discriminator 1)) [ 20.218480] Modules linked in: [ 20.219395] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.11.0-09341-gc055908abe0d #1 [ 20.221182] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 20.224540] EIP: create_trace_option_files (kbuild/src/consumer/kernel/trace/trace.c:8370 (discriminator 1)) [ 20.225816] Code: d5 01 83 15 2c b7 08 d5 00 83 c0 01 39 c8 0f 84 c7 00 00 00 8b 14 c7 39 72 44 75 df 83 05 10 b7 08 d5 01 83 15 14 b7 08 d5 00 <0f> 0b 83 05 18 b7 08 d5 01 83 15 1c b7 08 d5 00 83 05 20 b7 08 d5 All code ======== 0: d5 (bad) 1: 01 83 15 2c b7 08 add %eax,0x8b72c15(%rbx) 7: d5 (bad) 8: 00 83 c0 01 39 c8 add %al,-0x37c6fe40(%rbx) e: 0f 84 c7 00 00 00 je 0xdb 14: 8b 14 c7 mov (%rdi,%rax,8),%edx 17: 39 72 44 cmp %esi,0x44(%rdx) 1a: 75 df jne 0xfffffffffffffffb 1c: 83 05 10 b7 08 d5 01 addl $0x1,-0x2af748f0(%rip) # 0xffffffffd508b733 23: 83 15 14 b7 08 d5 00 adcl $0x0,-0x2af748ec(%rip) # 0xffffffffd508b73e 2a:* 0f 0b ud2 <-- trapping instruction 2c: 83 05 18 b7 08 d5 01 addl $0x1,-0x2af748e8(%rip) # 0xffffffffd508b74b 33: 83 15 1c b7 08 d5 00 adcl $0x0,-0x2af748e4(%rip) # 0xffffffffd508b756 3a: 83 .byte 0x83 3b: 05 20 b7 08 d5 add $0xd508b720,%eax Code starting with the faulting instruction =========================================== 0: 0f 0b ud2 2: 83 05 18 b7 08 d5 01 addl $0x1,-0x2af748e8(%rip) # 0xffffffffd508b721 9: 83 15 1c b7 08 d5 00 adcl $0x0,-0x2af748e4(%rip) # 0xffffffffd508b72c 10: 83 .byte 0x83 11: 05 20 b7 08 d5 add $0xd508b720,%eax [ 20.231135] EAX: 00000008 EBX: d3c49fc0 ECX: 00000009 EDX: d43fd620 [ 20.232662] ESI: d3c49f9c EDI: c1f63698 EBP: c1c73f0c ESP: c1c73ef0 [ 20.234528] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 EFLAGS: 00010246 [ 20.236313] CR0: 80050033 CR2: 00000000 CR3: 14949000 CR4: 000006d0 [ 20.238351] Call Trace: [ 20.239241] register_tracer (kbuild/src/consumer/kernel/trace/trace.c:5908 kbuild/src/consumer/kernel/trace/trace.c:2107) [ 20.240372] ? init_graph_trace (kbuild/src/consumer/kernel/trace/blktrace.c:2526) [ 20.241493] init_blk_tracer (kbuild/src/consumer/kernel/trace/blktrace.c:2545) [ 20.242804] do_one_initcall (kbuild/src/consumer/init/main.c:1223) [ 20.243862] ? rcu_read_lock_sched_held (kbuild/src/consumer/include/linux/lockdep.h:278 kbuild/src/consumer/kernel/rcu/update.c:125) [ 20.245103] ? trace_initcall_level (kbuild/src/consumer/include/trace/events/initcall.h:10 (discriminator 67)) [ 20.246611] kernel_init_freeable (kbuild/src/consumer/init/main.c:1295 kbuild/src/consumer/init/main.c:1312 kbuild/src/consumer/init/main.c:1332 kbuild/src/consumer/init/main.c:1533) [ 20.247834] ? rest_init (kbuild/src/consumer/init/main.c:1418) [ 20.248901] kernel_init (kbuild/src/consumer/init/main.c:1423) [ 20.249850] ret_from_fork (kbuild/src/consumer/arch/x86/entry/entry_32.S:856) [ 20.251381] irq event stamp: 4343293 [ 20.252533] hardirqs last enabled at (4343301): console_unlock (kbuild/src/consumer/kernel/printk/printk.c:2605 (discriminator 1)) [ 20.255052] hardirqs last disabled at (4343310): console_unlock (kbuild/src/consumer/kernel/printk/printk.c:2520 (discriminator 1)) [ 20.257109] softirqs last enabled at (4342794): __do_softirq (kbuild/src/consumer/arch/x86/include/asm/preempt.h:27 kbuild/src/consumer/kernel/softirq.c:371) [ 20.259404] softirqs last disabled at (4342789): call_on_stack (kbuild/src/consumer/arch/x86/kernel/irq_32.c:59) [ 20.261358] ---[ end trace bc5f5cafed183c31 ]--- [ 20.269773] Initialise system trusted keyrings [ 20.271532] Key type blacklist registered [ 20.286648] workingset: timestamp_bits=14 max_order=20 bucket_order=6 [ 20.434198] zbud: loaded [ 20.453926] DLM installed [ 20.490173] squashfs: version 4.0 (2009/01/31) Phillip Lougher [ 20.819671] FS-Cache: Netfs 'nfs' registered for caching [ 21.012308] NFS: Registering the id_resolver key type [ 21.013624] Key type id_resolver registered [ 21.014716] Key type id_legacy registered [ 21.016704] nfs4filelayout_init: NFSv4 File Layout Driver Registering... [ 21.018638] Installing knfsd (copyright (C) 1996 okir@monad.swb.de). [ 21.031359] utf8_selftest: All 154 tests passed [ 21.362307] _warn_unseeded_randomness: 252 callbacks suppressed [ 21.362324] random: get_random_u32 called from allocate_slab+0x13e/0x5a0 with crng_init=0 [ 21.365896] random: get_random_u32 called from copy_process+0x243/0x1900 with crng_init=0 [ 21.372082] random: get_random_u32 called from allocate_slab+0x13e/0x5a0 with crng_init=0 [ 22.826228] FS-Cache: Netfs 'cifs' registered for caching [ 22.827594] _warn_unseeded_randomness: 1 callbacks suppressed [ 22.827600] random: get_random_u32 called from __kmem_cache_create+0x26/0x3e0 with crng_init=0 [ 22.827622] random: get_random_u32 called from cache_random_seq_create+0x7c/0x140 with crng_init=0 [ 22.827831] random: get_random_u32 called from allocate_slab+0x13e/0x5a0 with crng_init=0 [ 22.840557] Key type cifs.spnego registered [ 22.842144] Key type cifs.idmap registered [ 22.844204] ntfs: driver 2.1.32 [Flags: R/W DEBUG]. [ 22.849844] efs: 1.0a - http://aeschi.ch.eu.org/efs/ [ 22.863659] romfs: ROMFS MTD (C) 2007 Red Hat, Inc. [ 22.866664] QNX4 filesystem 0.2.3 registered. [ 22.868611] qnx6: QNX6 filesystem 1.0.0 registered. [ 22.875183] fuse: init (API version 7.33) [ 22.882906] orangefs_debugfs_init: called with debug mask: :none: :0: [ 22.885270] orangefs_init: module version upstream loaded [ 22.888998] JFS: nTxBlock = 8192, nTxLock = 65536 [ 23.267140] SGI XFS with ACLs, security attributes, realtime, scrub, repair, quota, fatal assert, debug enabled [ 23.390479] 9p: Installing v9fs 9p2000 file system support [ 23.392589] FS-Cache: Netfs '9p' registered for caching [ 23.396857] NILFS version 2 loaded [ 23.398093] befs: version: 0.9.3 [ 23.408701] ocfs2: Registered cluster interface o2cb [ 23.410932] ocfs2: Registered cluster interface user [ 23.730184] OCFS2 User DLM kernel interface loaded [ 24.058434] _warn_unseeded_randomness: 236 callbacks suppressed [ 24.058447] random: get_random_u32 called from __kmem_cache_create+0x26/0x3e0 with crng_init=0 [ 24.058479] random: get_random_u32 called from cache_random_seq_create+0x7c/0x140 with crng_init=0 [ 24.058652] random: get_random_u32 called from allocate_slab+0x13e/0x5a0 with crng_init=0 [ 24.073256] gfs2: GFS2 installed [ 24.097912] FS-Cache: Netfs 'ceph' registered for caching [ 24.099396] ceph: loaded (mds proto 32) [ 24.105556] Smack: Registering netfilter hooks [ 24.107358] integrity: Platform Keyring initialized [ 24.108531] Allocating IMA blacklist keyring. [ 24.403512] NET: Registered protocol family 38 [ 24.405457] xor: measuring software checksum speed [ 24.408022] pIII_sse : 7748 MB/sec [ 24.410377] prefetch64-sse : 9042 MB/sec [ 24.411478] xor: using function: prefetch64-sse (9042 MB/sec) [ 24.412923] async_tx: api initialized (async) [ 24.414256] Key type asymmetric registered [ 24.415613] Asymmetric key parser 'x509' registered [ 24.416969] Asymmetric key parser 'pkcs8' registered [ 24.418337] Key type pkcs7_test registered [ 24.419419] Asymmetric key parser 'tpm_parser' registered [ 24.420996] bounce: pool size: 64 pages [ 24.423333] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 235) [ 24.425884] io scheduler mq-deadline registered [ 24.427055] io scheduler kyber registered [ 24.429756] io scheduler bfq registered [ 24.833213] String selftests succeeded [ 24.834768] test_printf: loaded. [ 24.835938] test_printf: crng possibly not yet initialized. plain 'p' buffer contains "(ptrval)" [ 24.836004] test_printf: crng possibly not yet initialized. plain 'p' buffer contains "(ptrval)" [ 24.839089] test_printf: crng possibly not yet initialized. plain 'p' buffer contains "(ptrval)" [ 24.849973] test_printf: all 388 tests passed [ 24.852954] test_bitmap: loaded. [ 24.854346] test_bitmap: parselist: 14: input is '0-2047:128/256' OK, Time: 2067 [ 24.860960] test_bitmap: all 1679 tests passed [ 24.862251] test_strscpy: loaded. [ 24.863216] test_strscpy: all 32 tests passed [ 24.870583] test_stackinit: u8_zero ok [ 24.871767] test_stackinit: u16_zero ok [ 24.872830] test_stackinit: u32_zero ok [ 24.873980] test_stackinit: u64_zero ok [ 24.874903] test_stackinit: char_array_zero ok [ 24.875902] test_stackinit: small_hole_zero ok [ 24.876904] test_stackinit: big_hole_zero ok [ 24.878022] test_stackinit: trailing_hole_zero ok [ 24.879097] test_stackinit: packed_zero ok [ 24.880030] test_stackinit: small_hole_dynamic_partial ok [ 24.881209] test_stackinit: big_hole_dynamic_partial ok [ 24.882487] test_stackinit: trailing_hole_dynamic_partial ok [ 24.883687] test_stackinit: packed_dynamic_partial ok [ 24.884812] test_stackinit: small_hole_static_partial ok [ 24.886164] test_stackinit: big_hole_static_partial ok [ 24.887342] test_stackinit: trailing_hole_static_partial ok [ 24.888571] test_stackinit: packed_static_partial ok [ 24.889676] test_stackinit: small_hole_static_all FAIL (uninit bytes: 3) [ 24.891127] test_stackinit: big_hole_static_all FAIL (uninit bytes: 61) [ 24.892513] test_stackinit: trailing_hole_static_all FAIL (uninit bytes: 3) [ 24.894015] test_stackinit: packed_static_all ok [ 24.895117] test_stackinit: small_hole_dynamic_all FAIL (uninit bytes: 3) To reproduce: # build kernel cd linux cp config-5.11.0-09341-gc055908abe0d .config make HOSTCC=gcc-9 CC=gcc-9 ARCH=i386 olddefconfig prepare modules_prepare bzImage git clone https://github.com/intel/lkp-tests.git cd lkp-tests bin/lkp qemu -k job-script # job-script is attached in this email Thanks, Oliver Sang