F2FS-fs (loop4): Magic Mismatch, valid(0xf2f52010) - read(0x0)
F2FS-fs (loop4): Can't find valid F2FS filesystem in 2th superblock
F2FS-fs (loop4): invalid crc_offset: 0
F2FS-fs (loop4): Try to recover 2th superblock, ret: 0
F2FS-fs (loop4): Mounted with checkpoint version = 27d57943
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BUG: KMSAN: uninit-value in f2fs_lookup+0xe05/0x1a80 fs/f2fs/namei.c:503
CPU: 1 PID: 10846 Comm: syz-executor.4 Not tainted 5.9.0-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:77 [inline]
 dump_stack+0x21c/0x280 lib/dump_stack.c:118
 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:122
 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:219
 f2fs_lookup+0xe05/0x1a80 fs/f2fs/namei.c:503
 __lookup_hash+0x2ac/0x580 fs/namei.c:1445
 filename_create+0x376/0xd10 fs/namei.c:3467
 user_path_create fs/namei.c:3524 [inline]
 do_mkdirat+0x11c/0x700 fs/namei.c:3664
 __do_sys_mkdirat fs/namei.c:3683 [inline]
 __se_sys_mkdirat+0x92/0xb0 fs/namei.c:3681
 __ia32_sys_mkdirat+0x4a/0x70 fs/namei.c:3681
 do_syscall_32_irqs_on arch/x86/entry/common.c:80 [inline]
 __do_fast_syscall_32+0x129/0x180 arch/x86/entry/common.c:139
 do_fast_syscall_32+0x6a/0xc0 arch/x86/entry/common.c:162
 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:205
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7f81549
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f557b0cc EFLAGS: 00000296 ORIG_RAX: 0000000000000128
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000200000c0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Local variable ----page@f2fs_lookup created at:
 f2fs_lookup+0x8f/0x1a80 fs/f2fs/namei.c:477
 f2fs_lookup+0x8f/0x1a80 fs/f2fs/namei.c:477
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