BUG: unable to handle page fault for address: 00000a50ffffea08
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 0 P4D 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 8445 Comm: syz-fuzzer Not tainted 5.12.0-rc8-next-20210421-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:find_stack lib/stackdepot.c:209 [inline]
RIP: 0010:stack_depot_save+0x12b/0x4e0 lib/stackdepot.c:281
Code: 05 da e5 b7 0c 89 da 81 e2 ff ff 0f 00 4c 8d 3c d0 4d 8b 37 4d 85 f6 75 11 e9 94 00 00 00 4d 8b 36 4d 85 f6 0f 84 88 00 00 00 <41> 39 5e 08 75 ee 45 3b 66 0c 75 e8 31 c0 49 8b 4c c6 18 48 39 4c
RSP: 0018:ffffc9000168f938 EFLAGS: 00010206
RAX: ffff88823b000000 RBX: 00000000ad6ffc92 RCX: 0000000000000001
RDX: 00000000000ffc92 RSI: 0000000000000800 RDI: 00000000db36846a
RBP: ffffc9000168f9a8 R08: 000000008c561b03 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 000000000000000b
R13: 000000000000000b R14: 00000a50ffffea00 R15: ffff88823b7fe490
FS:  000000c00002e490(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000a50ffffea08 CR3: 00000000294e0000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 kasan_save_stack+0x32/0x40 mm/kasan/common.c:40
 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357
 ____kasan_slab_free mm/kasan/common.c:360 [inline]
 ____kasan_slab_free mm/kasan/common.c:325 [inline]
 __kasan_slab_free+0xfb/0x130 mm/kasan/common.c:368
 kasan_slab_free include/linux/kasan.h:212 [inline]
 slab_free_hook mm/slub.c:1593 [inline]
 slab_free_freelist_hook+0xdf/0x240 mm/slub.c:1618
 slab_free mm/slub.c:3178 [inline]
 kmem_cache_free+0x97/0x750 mm/slub.c:3194
 putname+0xe1/0x120 fs/namei.c:259
 filename_lookup+0x3c3/0x570 fs/namei.c:2464
 user_path_at include/linux/namei.h:60 [inline]
 __do_sys_chdir fs/open.c:493 [inline]
 __se_sys_chdir fs/open.c:487 [inline]
 __x64_sys_chdir+0xb7/0x260 fs/open.c:487
 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4af276
Code: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 1b 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30
RSP: 002b:000000c000467388 EFLAGS: 00000202 ORIG_RAX: 0000000000000050
RAX: ffffffffffffffda RBX: 000000c00002e400 RCX: 00000000004af276
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000c003a36120
RBP: 000000c000467528 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000202 R12: 00000000004a7ad8
R13: 0000000000000008 R14: 0000000000000007 R15: 00000000000000aa
Modules linked in:
CR2: 00000a50ffffea08
---[ end trace fc5144499fff8c7b ]---
RIP: 0010:find_stack lib/stackdepot.c:209 [inline]
RIP: 0010:stack_depot_save+0x12b/0x4e0 lib/stackdepot.c:281
Code: 05 da e5 b7 0c 89 da 81 e2 ff ff 0f 00 4c 8d 3c d0 4d 8b 37 4d 85 f6 75 11 e9 94 00 00 00 4d 8b 36 4d 85 f6 0f 84 88 00 00 00 <41> 39 5e 08 75 ee 45 3b 66 0c 75 e8 31 c0 49 8b 4c c6 18 48 39 4c
RSP: 0018:ffffc9000168f938 EFLAGS: 00010206
RAX: ffff88823b000000 RBX: 00000000ad6ffc92 RCX: 0000000000000001
RDX: 00000000000ffc92 RSI: 0000000000000800 RDI: 00000000db36846a
RBP: ffffc9000168f9a8 R08: 000000008c561b03 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 000000000000000b
R13: 000000000000000b R14: 00000a50ffffea00 R15: ffff88823b7fe490
FS:  000000c00002e490(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0a6403f098 CR3: 00000000294e0000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400