bisecting fixing commit since f8ad8187c3b536ee2b10502a8340c014204a1af0 building syzkaller on 52e3731913ab2677be27c29ed8142b04e8f28521 testing commit f8ad8187c3b536ee2b10502a8340c014204a1af0 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 97449f8c0ded7b99bb816fac7fc1c229551a8b3bd19180634cfff8abdde969da run #0: crashed: KASAN: use-after-free Read in ext4_xattr_set_entry run #1: crashed: KASAN: use-after-free Read in ext4_xattr_set_entry run #2: crashed: KASAN: use-after-free Read in ext4_xattr_set_entry run #3: crashed: KASAN: use-after-free Read in ext4_xattr_set_entry run #4: crashed: KASAN: use-after-free Read in ext4_xattr_set_entry run #5: crashed: KASAN: use-after-free Read in ext4_xattr_set_entry run #6: crashed: KASAN: use-after-free Read in ext4_xattr_set_entry run #7: crashed: KASAN: use-after-free Read in ext4_xattr_set_entry run #8: crashed: KASAN: use-after-free Read in ext4_xattr_set_entry run #9: crashed: KASAN: out-of-bounds Read in ext4_xattr_set_entry run #10: crashed: KASAN: use-after-free Read in ext4_xattr_set_entry run #11: OK run #12: OK run #13: OK run #14: OK run #15: OK run #16: OK run #17: OK run #18: OK run #19: OK testing current HEAD eccea80be2576dee642bc6cab20f1a242d58a08c testing commit eccea80be2576dee642bc6cab20f1a242d58a08c compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 17f7d5a51edf93abc300f6690607509d5f771eaab7ca6778c4a66009160d6e53 run #0: crashed: KASAN: use-after-free Read in ext4_xattr_set_entry run #1: crashed: KASAN: use-after-free Read in ext4_xattr_set_entry run #2: crashed: KASAN: use-after-free Read in ext4_xattr_set_entry run #3: crashed: KASAN: use-after-free Read in ext4_xattr_set_entry run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK reproducer seems to be flaky Reproducer flagged being flaky revisions tested: 2, total time: 33m27.048128512s (build: 10m19.854672778s, test: 22m17.958803008s) the crash still happens on HEAD commit msg: Merge tag 'block-5.16-2021-12-10' of git://git.kernel.dk/linux-block crash: KASAN: use-after-free Read in ext4_xattr_set_entry ================================================================== BUG: KASAN: use-after-free in ext4_xattr_set_entry+0xc14/0x37a0 fs/ext4/xattr.c:1593 Read of size 4 at addr ffff88806584f004 by task syz-executor.3/8966 CPU: 1 PID: 8966 Comm: syz-executor.3 Not tainted 5.16.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x45/0x59 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x8d/0x320 mm/kasan/report.c:247 __kasan_report mm/kasan/report.c:433 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:450 ext4_xattr_set_entry+0xc14/0x37a0 fs/ext4/xattr.c:1593 ext4_xattr_ibody_set+0x60/0x260 fs/ext4/xattr.c:2210 ext4_xattr_set_handle+0x71c/0x10e0 fs/ext4/xattr.c:2367 ext4_xattr_set+0x11d/0x2c0 fs/ext4/xattr.c:2480 __vfs_setxattr+0xdb/0x130 fs/xattr.c:180 __vfs_setxattr_noperm+0xee/0x590 fs/xattr.c:214 vfs_setxattr+0x111/0x2d0 fs/xattr.c:301 setxattr+0x157/0x260 fs/xattr.c:575 path_setxattr+0x13c/0x170 fs/xattr.c:595 __do_sys_setxattr fs/xattr.c:611 [inline] __se_sys_setxattr fs/xattr.c:607 [inline] __x64_sys_setxattr+0xbb/0x150 fs/xattr.c:607 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465b09 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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:00007f8196cc2188 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465b09 RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000020000100 RBP: 00000000004b069f R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffddd67b0bf R14: 00007f8196cc2300 R15: 0000000000022000 The buggy address belongs to the page: page:000000006de662da refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x6584f flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 ffffea0001b743c8 ffffea0001965ac8 0000000000000000 raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88806584ef00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88806584ef80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88806584f000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88806584f080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88806584f100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================