Hello, When using Healer to fuzz the latest Linux kernel, the following crash was triggered. HEAD commit: 0513e464f900 Merge tag 'perf-tools-fixes-for-v5.15-2021-09-27' git tree: upstream console output: https://drive.google.com/file/d/1vm5fDM220kkghoiGa3Aw_Prl4O_pqAXF/view?usp=sharing kernel config: https://drive.google.com/file/d/1Jqhc4DpCVE8X7d-XBdQnrMoQzifTG5ho/view?usp=sharing Sorry, I don't have a reproducer for this crash, hope the symbolized report can help. If you fix this issue, please add the following tag to the commit: Reported-by: Hao Sun <sunhao.th@xxxxxxxxx> FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 28965 Comm: syz-executor Not tainted 5.15.0-rc3+ #21 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x8d/0xcf lib/dump_stack.c:106 fail_dump lib/fault-inject.c:52 [inline] should_fail+0x13c/0x160 lib/fault-inject.c:146 should_failslab+0x5/0x10 mm/slab_common.c:1328 slab_pre_alloc_hook.constprop.99+0x4e/0xc0 mm/slab.h:494 slab_alloc_node mm/slub.c:3120 [inline] __kmalloc_node+0x6b/0x240 mm/slub.c:4435 kmalloc_node include/linux/slab.h:614 [inline] kvmalloc_node+0x33/0xe0 mm/util.c:587 kvmalloc include/linux/mm.h:805 [inline] xlog_cil_alloc_shadow_bufs fs/xfs/xfs_log_cil.c:224 [inline] xlog_cil_commit+0x181/0xe20 fs/xfs/xfs_log_cil.c:1280 __xfs_trans_commit+0x239/0x5a0 fs/xfs/xfs_trans.c:881 xfs_create+0x80b/0x900 fs/xfs/xfs_inode.c:1091 xfs_generic_create+0x16c/0x470 fs/xfs/xfs_iops.c:197 lookup_open+0x660/0x780 fs/namei.c:3282 open_last_lookups fs/namei.c:3352 [inline] path_openat+0x465/0xe20 fs/namei.c:3557 do_filp_open+0xe3/0x170 fs/namei.c:3588 do_sys_openat2+0x357/0x4a0 fs/open.c:1200 do_sys_open+0x87/0xd0 fs/open.c:1216 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x34/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x46ae99 Code: f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f847c2eec48 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 000000000078c158 RCX: 000000000046ae99 RDX: 0000000000000000 RSI: 0000000000000021 RDI: 00000000200b5040 RBP: 00007f847c2eec80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000000c R13: 0000000000000000 R14: 000000000078c158 R15: 00007ffd4ca99420 BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 10a56e067 P4D 10a56e067 PUD 10e1e3067 PMD 0 Oops: 0002 [#1] PREEMPT SMP CPU: 0 PID: 28965 Comm: syz-executor Not tainted 5.15.0-rc3+ #21 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 RIP: 0010:memset_erms+0x9/0x10 arch/x86/lib/memset_64.S:64 Code: c1 e9 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 f3 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 <f3> aa 4c 89 c8 c3 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 01 RSP: 0018:ffffc9000efab998 EFLAGS: 00010202 RAX: 0000000000000000 RBX: ffff88810fa73198 RCX: 0000000000000058 RDX: 0000000000000058 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff888110c00108 R08: 0000000000000cc0 R09: 0000000000000000 R10: ffffffff81499943 R11: 0000000000000005 R12: 0000000000000210 R13: 0000000000000000 R14: 0000000000000268 R15: 0000000000000000 FS: 00007f847c2ef700(0000) GS:ffff88807dc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000010c42b000 CR4: 0000000000750ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 PKRU: 55555554 Call Trace: memset include/linux/fortify-string.h:175 [inline] xlog_cil_alloc_shadow_bufs fs/xfs/xfs_log_cil.c:225 [inline] xlog_cil_commit+0x1a1/0xe20 fs/xfs/xfs_log_cil.c:1280 __xfs_trans_commit+0x239/0x5a0 fs/xfs/xfs_trans.c:881 xfs_create+0x80b/0x900 fs/xfs/xfs_inode.c:1091 xfs_generic_create+0x16c/0x470 fs/xfs/xfs_iops.c:197 lookup_open+0x660/0x780 fs/namei.c:3282 open_last_lookups fs/namei.c:3352 [inline] path_openat+0x465/0xe20 fs/namei.c:3557 do_filp_open+0xe3/0x170 fs/namei.c:3588 do_sys_openat2+0x357/0x4a0 fs/open.c:1200 do_sys_open+0x87/0xd0 fs/open.c:1216 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x34/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x46ae99 Code: f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f847c2eec48 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 000000000078c158 RCX: 000000000046ae99 RDX: 0000000000000000 RSI: 0000000000000021 RDI: 00000000200b5040 RBP: 00007f847c2eec80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000000c R13: 0000000000000000 R14: 000000000078c158 R15: 00007ffd4ca99420 Modules linked in: Dumping ftrace buffer: (ftrace buffer empty) CR2: 0000000000000000 ---[ end trace 1d10d5c699ef1895 ]--- RIP: 0010:memset_erms+0x9/0x10 arch/x86/lib/memset_64.S:64 Code: c1 e9 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 f3 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 <f3> aa 4c 89 c8 c3 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 01 RSP: 0018:ffffc9000efab998 EFLAGS: 00010202 RAX: 0000000000000000 RBX: ffff88810fa73198 RCX: 0000000000000058 RDX: 0000000000000058 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff888110c00108 R08: 0000000000000cc0 R09: 0000000000000000 R10: ffffffff81499943 R11: 0000000000000005 R12: 0000000000000210 R13: 0000000000000000 R14: 0000000000000268 R15: 0000000000000000 FS: 00007f847c2ef700(0000) GS:ffff88807dc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000010c42b000 CR4: 0000000000750ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 PKRU: 55555554 ---------------- Code disassembly (best guess): 0: c1 e9 03 shr $0x3,%ecx 3: 40 0f b6 f6 movzbl %sil,%esi 7: 48 b8 01 01 01 01 01 movabs $0x101010101010101,%rax e: 01 01 01 11: 48 0f af c6 imul %rsi,%rax 15: f3 48 ab rep stos %rax,%es:(%rdi) 18: 89 d1 mov %edx,%ecx 1a: f3 aa rep stos %al,%es:(%rdi) 1c: 4c 89 c8 mov %r9,%rax 1f: c3 retq 20: 90 nop 21: 49 89 f9 mov %rdi,%r9 24: 40 88 f0 mov %sil,%al 27: 48 89 d1 mov %rdx,%rcx * 2a: f3 aa rep stos %al,%es:(%rdi) <-- trapping instruction 2c: 4c 89 c8 mov %r9,%rax 2f: c3 retq 30: 90 nop 31: 49 89 fa mov %rdi,%r10 34: 40 0f b6 ce movzbl %sil,%ecx 38: 48 rex.W 39: b8 01 01 01 01 mov $0x1010101,%eax 3e: 01 01 add %eax,(%rcx)
