KASAN: use-after-free Read in f2fs_release_page (3)

Status: premoderation: reported on 2026/09/11 19:10
Reported-by: syzbot+024c52715a4a42503e8a@syzkaller.appspotmail.com
First crash: 26d, last: 13h01m
▶ ▼ Similar bugs (9)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-5-10 general protection fault in f2fs_release_page f2fs 19 3 1351d 1393d 0/2 auto-obsoleted due to no activity on 2023/04/25 16:26
android-54 KASAN: use-after-free Read in f2fs_release_page f2fs 19 4 1283d 1383d 0/2 auto-obsoleted due to no activity on 2023/08/01 23:35
android-5-10 KASAN: use-after-free Read in f2fs_release_page 19 2 345d 354d 0/2 auto-obsoleted due to no activity on 2026/01/25 17:02
android-5-15 KASAN: use-after-free Read in f2fs_release_page f2fs 19 5 1222d 1371d 0/2 auto-obsoleted due to no activity on 2023/09/01 18:51
android-5-15 KASAN: use-after-free Read in f2fs_release_page (2) 19 1 1011d 1011d 0/2 auto-obsoleted due to no activity on 2024/03/30 07:06
android-5-10 KASAN: global-out-of-bounds Read in f2fs_release_page 19 2 1221d 1253d 0/2 auto-obsoleted due to no activity on 2023/09/02 15:33
android-5-10 KASAN: use-after-free Read in f2fs_release_page (2) 19 2 16d 66d 0/2 premoderation: reported on 2026/08/02 22:50
android-5-15 general protection fault in f2fs_release_page 2 1 648d 648d 0/2 auto-obsoleted due to no activity on 2025/03/28 09:40
android-5-10 general protection fault in f2fs_release_page (2) 2 1 166d 166d 0/2 auto-obsoleted due to no activity on 2026/07/24 03:25

Sample crash report:
==================================================================
BUG: KASAN: use-after-free in F2FS_SB fs/f2fs/f2fs.h:1994 [inline]
BUG: KASAN: use-after-free in F2FS_I_SB fs/f2fs/f2fs.h:1999 [inline]
BUG: KASAN: use-after-free in F2FS_M_SB fs/f2fs/f2fs.h:2004 [inline]
BUG: KASAN: use-after-free in F2FS_P_SB fs/f2fs/f2fs.h:2009 [inline]
BUG: KASAN: use-after-free in f2fs_release_page+0x222/0x7c0 fs/f2fs/data.c:3773
Read of size 8 at addr ffff88811d0973c8 by task syz.5.2182/8705

CPU: 1 PID: 8705 Comm: syz.5.2182 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:88
 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:427 [inline]
 kasan_report+0x10f/0x150 mm/kasan/report.c:444
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309
 F2FS_SB fs/f2fs/f2fs.h:1994 [inline]
 F2FS_I_SB fs/f2fs/f2fs.h:1999 [inline]
 F2FS_M_SB fs/f2fs/f2fs.h:2004 [inline]
 F2FS_P_SB fs/f2fs/f2fs.h:2009 [inline]
 f2fs_release_page+0x222/0x7c0 fs/f2fs/data.c:3773
 try_to_release_page+0x18d/0x1e0 mm/filemap.c:4082
 shrink_page_list+0x25ff/0x5800 mm/vmscan.c:1793
 shrink_inactive_list mm/vmscan.c:2338 [inline]
 shrink_list mm/vmscan.c:2583 [inline]
 shrink_lruvec+0x11eb/0x3b00 mm/vmscan.c:5800
 shrink_node_memcgs mm/vmscan.c:5992 [inline]
 shrink_node+0x11ee/0x2a40 mm/vmscan.c:6022
 shrink_zones mm/vmscan.c:6228 [inline]
 do_try_to_free_pages+0x5a7/0x1580 mm/vmscan.c:6286
 try_to_free_mem_cgroup_pages+0x261/0x610 mm/vmscan.c:6600
 mem_cgroup_force_empty mm/memcontrol.c:3595 [inline]
 mem_cgroup_force_empty_write+0x130/0x170 mm/memcontrol.c:3616
 cgroup_file_write+0x294/0x560 kernel/cgroup/cgroup.c:4011
 kernfs_fop_write_iter+0x2bd/0x400 fs/kernfs/file.c:296
 call_write_iter include/linux/fs.h:2218 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0x831/0xfd0 fs/read_write.c:594
 ksys_write+0x14a/0x260 fs/read_write.c:647
 __do_sys_write fs/read_write.c:659 [inline]
 __se_sys_write fs/read_write.c:656 [inline]
 __x64_sys_write+0x7b/0x90 fs/read_write.c:656
 x64_sys_call+0x8ef/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f74dbcbb199
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f74da714028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f74dbf42fa0 RCX: 00007f74dbcbb199
RDX: 0000000000000001 RSI: 00002000000002c0 RDI: 000000000000000a
RBP: 00007f74dbd528e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f74dbf43038 R14: 00007f74dbf42fa0 R15: 00007ffe06e687c8
 </TASK>

Allocated by task 8468:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:433 [inline]
 ____kasan_kmalloc mm/kasan/common.c:512 [inline]
 __kasan_kmalloc+0xd4/0x100 mm/kasan/common.c:521
 kasan_kmalloc include/linux/kasan.h:227 [inline]
 kmem_cache_alloc_trace+0x119/0x270 mm/slub.c:3274
 kmalloc include/linux/slab.h:619 [inline]
 kzalloc include/linux/slab.h:750 [inline]
 alloc_super+0x5e/0x840 fs/super.c:203
 sget+0x1e2/0x4c0 fs/super.c:637
 mount_bdev+0xec/0x3c0 fs/super.c:1384
 f2fs_mount+0x34/0x40 fs/f2fs/super.c:4713
 legacy_get_tree+0xed/0x190 fs/fs_context.c:611
 vfs_get_tree+0x89/0x260 fs/super.c:1541
 do_new_mount+0x251/0xb40 fs/namespace.c:3037
 path_mount+0x640/0xff0 fs/namespace.c:3367
 do_mount fs/namespace.c:3380 [inline]
 __do_sys_mount fs/namespace.c:3588 [inline]
 __se_sys_mount+0x320/0x390 fs/namespace.c:3565
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3565
 x64_sys_call+0x6bf/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

Freed by task 60:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4a/0x70 mm/kasan/common.c:45
 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:365
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373
 kasan_slab_free include/linux/kasan.h:193 [inline]
 slab_free_hook mm/slub.c:1728 [inline]
 slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1754
 slab_free mm/slub.c:3526 [inline]
 kfree+0xc4/0x270 mm/slub.c:4588
 destroy_super_work+0x40/0x50 fs/super.c:165
 process_one_work+0x6c8/0xbb0 kernel/workqueue.c:2328
 worker_thread+0xaa0/0x1250 kernel/workqueue.c:2475
 kthread+0x3f5/0x4f0 kernel/kthread.c:337
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287

Last potentially related work creation:
 kasan_save_stack+0x3a/0x60 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xd2/0x100 mm/kasan/generic.c:348
 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358
 insert_work+0x51/0x310 kernel/workqueue.c:1373
 __queue_work+0x8e1/0xc60 kernel/workqueue.c:1539
 queue_work_on+0xde/0x150 kernel/workqueue.c:1566
 queue_work include/linux/workqueue.h:510 [inline]
 schedule_work include/linux/workqueue.h:571 [inline]
 destroy_super_rcu+0xd1/0xe0 fs/super.c:172
 rcu_do_batch+0x4c1/0xbf0 kernel/rcu/tree.c:2523
 rcu_core+0x4a3/0xef0 kernel/rcu/tree.c:2763
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2776
 handle_softirqs+0x250/0x560 kernel/softirq.c:583
 __do_softirq kernel/softirq.c:621 [inline]
 invoke_softirq kernel/softirq.c:443 [inline]
 __irq_exit_rcu+0x52/0xf0 kernel/softirq.c:670
 irq_exit_rcu+0x9/0x10 kernel/softirq.c:682
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa9/0xc0 arch/x86/kernel/apic/apic.c:1108
 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:676

Second to last potentially related work creation:
 kasan_save_stack+0x3a/0x60 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xd2/0x100 mm/kasan/generic.c:348
 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358
 __call_rcu_common kernel/rcu/tree.c:3011 [inline]
 call_rcu+0x10b/0xf60 kernel/rcu/tree.c:3129
 __put_super+0x26b/0x2d0 fs/super.c:299
 put_super fs/super.c:313 [inline]
 deactivate_locked_super+0xd4/0x100 fs/super.c:346
 deactivate_super+0xaf/0xe0 fs/super.c:366
 cleanup_mnt+0x44f/0x500 fs/namespace.c:1149
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1156
 task_work_run+0x127/0x190 kernel/task_work.c:188
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0xd0/0xe0 kernel/entry/common.c:184
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:217
 __syscall_exit_to_user_mode_work kernel/entry/common.c:299 [inline]
 syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:310
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

The buggy address belongs to the object at ffff88811d097000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 968 bytes inside of
 2048-byte region [ffff88811d097000, ffff88811d097800)
The buggy address belongs to the page:
page:ffffea0004742400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11d090
head:ffffea0004742400 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 0000000000000000 0000000100000001 ffff888100043200
raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 2852, ts 175384189039, free_ts 175382175299
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2607
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2613
 get_page_from_freelist+0x2c3a/0x2cd0 mm/page_alloc.c:4487
 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5824
 alloc_slab_page mm/slub.c:-1 [inline]
 allocate_slab mm/slub.c:1937 [inline]
 new_slab+0xa0/0x4d0 mm/slub.c:2000
 ___slab_alloc+0x3ac/0x840 mm/slub.c:3033
 __slab_alloc+0x49/0x90 mm/slub.c:3120
 slab_alloc_node mm/slub.c:3211 [inline]
 slab_alloc mm/slub.c:3255 [inline]
 __kmalloc_track_caller+0x169/0x2c0 mm/slub.c:4954
 kmalloc_reserve net/core/skbuff.c:357 [inline]
 __alloc_skb+0x210/0x730 net/core/skbuff.c:428
 alloc_skb include/linux/skbuff.h:1183 [inline]
 nlmsg_new include/net/netlink.h:953 [inline]
 audit_buffer_alloc kernel/audit.c:1806 [inline]
 audit_log_start+0x407/0x8a0 kernel/audit.c:1924
 audit_seccomp+0x62/0x160 kernel/auditsc.c:2726
 seccomp_log kernel/seccomp.c:988 [inline]
 __seccomp_filter+0xadc/0x1930 kernel/seccomp.c:1254
 __secure_computing+0xea/0x290 kernel/seccomp.c:1316
 syscall_trace_enter+0xd3/0x180 kernel/entry/common.c:71
 __syscall_enter_from_user_work kernel/entry/common.c:99 [inline]
 syscall_enter_from_user_mode+0x1f/0x30 kernel/entry/common.c:117
 do_syscall_64+0x24/0xa0 arch/x86/entry/common.c:76
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 free_pages_prepare mm/page_alloc.c:1474 [inline]
 free_pcp_prepare mm/page_alloc.c:1546 [inline]
 free_unref_page_prepare+0x5fa/0x600 mm/page_alloc.c:3536
 free_unref_page+0xae/0x540 mm/page_alloc.c:3618
 free_the_page mm/page_alloc.c:805 [inline]
 __free_pages+0x6c/0x100 mm/page_alloc.c:5900
 __free_slab+0xe5/0x1e0 mm/slub.c:2025
 free_slab mm/slub.c:2040 [inline]
 discard_slab mm/slub.c:2046 [inline]
 __unfreeze_partials+0x15a/0x190 mm/slub.c:2532
 put_cpu_partial+0xc6/0x120 mm/slub.c:2612
 __slab_free+0x1d4/0x290 mm/slub.c:3395
 do_slab_free mm/slub.c:3514 [inline]
 ___cache_free+0x104/0x120 mm/slub.c:3535
 qlink_free+0x4d/0x90 mm/kasan/quarantine.c:157
 qlist_free_all+0x5f/0xb0 mm/kasan/quarantine.c:176
 kasan_quarantine_reduce+0x14a/0x170 mm/kasan/quarantine.c:283
 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:443
 kasan_slab_alloc include/linux/kasan.h:217 [inline]
 slab_post_alloc_hook+0x4f/0x2b0 mm/slab.h:550
 slab_alloc_node mm/slub.c:3245 [inline]
 slab_alloc mm/slub.c:3255 [inline]
 kmem_cache_alloc+0xf7/0x260 mm/slub.c:3260
 audit_buffer_alloc kernel/audit.c:1802 [inline]
 audit_log_start+0x3e5/0x8a0 kernel/audit.c:1924
 audit_seccomp+0x62/0x160 kernel/auditsc.c:2726

Memory state around the buggy address:
 ffff88811d097280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88811d097300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88811d097380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                              ^
 ffff88811d097400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88811d097480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
general protection fault, probably for non-canonical address 0xdffffc00000000e9: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000748-0x000000000000074f]
CPU: 0 PID: 8705 Comm: syz.5.2182 Tainted: G    B   W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:f2fs_release_page+0x233/0x7c0 fs/f2fs/data.c:3773
Code: 4d 03 27 4c 89 e0 48 c1 e8 03 42 80 3c 30 00 74 08 4c 89 e7 e8 ae 3a 94 ff 41 bf 48 07 00 00 4d 03 3c 24 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 0f 85 41 05 00 00 45 8b 3f 44 89 fe 81 e6 00
RSP: 0018:ffffc90000d76d50 EFLAGS: 00010202
RAX: 00000000000000e9 RBX: ffffea00049ee6c0 RCX: 0000000000080000
RDX: ffffc90006bae000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc90000d76d88 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff0e1904c R12: ffff88811d0973c8
R13: ffffea00049ee6c8 R14: dffffc0000000000 R15: 0000000000000748
FS:  00007f74da7146c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007feb4b0ce880 CR3: 000000010d5ea000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 try_to_release_page+0x18d/0x1e0 mm/filemap.c:4082
 shrink_page_list+0x25ff/0x5800 mm/vmscan.c:1793
 shrink_inactive_list mm/vmscan.c:2338 [inline]
 shrink_list mm/vmscan.c:2583 [inline]
 shrink_lruvec+0x11eb/0x3b00 mm/vmscan.c:5800
 shrink_node_memcgs mm/vmscan.c:5992 [inline]
 shrink_node+0x11ee/0x2a40 mm/vmscan.c:6022
 shrink_zones mm/vmscan.c:6228 [inline]
 do_try_to_free_pages+0x5a7/0x1580 mm/vmscan.c:6286
 try_to_free_mem_cgroup_pages+0x261/0x610 mm/vmscan.c:6600
 mem_cgroup_force_empty mm/memcontrol.c:3595 [inline]
 mem_cgroup_force_empty_write+0x130/0x170 mm/memcontrol.c:3616
 cgroup_file_write+0x294/0x560 kernel/cgroup/cgroup.c:4011
 kernfs_fop_write_iter+0x2bd/0x400 fs/kernfs/file.c:296
 call_write_iter include/linux/fs.h:2218 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0x831/0xfd0 fs/read_write.c:594
 ksys_write+0x14a/0x260 fs/read_write.c:647
 __do_sys_write fs/read_write.c:659 [inline]
 __se_sys_write fs/read_write.c:656 [inline]
 __x64_sys_write+0x7b/0x90 fs/read_write.c:656
 x64_sys_call+0x8ef/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f74dbcbb199
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f74da714028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f74dbf42fa0 RCX: 00007f74dbcbb199
RDX: 0000000000000001 RSI: 00002000000002c0 RDI: 000000000000000a
RBP: 00007f74dbd528e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f74dbf43038 R14: 00007f74dbf42fa0 R15: 00007ffe06e687c8
 </TASK>
Modules linked in:
---[ end trace 3e0775c17b7e881e ]---
RIP: 0010:f2fs_release_page+0x233/0x7c0 fs/f2fs/data.c:3773
Code: 4d 03 27 4c 89 e0 48 c1 e8 03 42 80 3c 30 00 74 08 4c 89 e7 e8 ae 3a 94 ff 41 bf 48 07 00 00 4d 03 3c 24 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 0f 85 41 05 00 00 45 8b 3f 44 89 fe 81 e6 00
RSP: 0018:ffffc90000d76d50 EFLAGS: 00010202
RAX: 00000000000000e9 RBX: ffffea00049ee6c0 RCX: 0000000000080000
RDX: ffffc90006bae000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc90000d76d88 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff0e1904c R12: ffff88811d0973c8
R13: ffffea00049ee6c8 R14: dffffc0000000000 R15: 0000000000000748
FS:  00007f74da7146c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbc86c97000 CR3: 000000010d5ea000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	4d 03 27             	add    (%r15),%r12
   3:	4c 89 e0             	mov    %r12,%rax
   6:	48 c1 e8 03          	shr    $0x3,%rax
   a:	42 80 3c 30 00       	cmpb   $0x0,(%rax,%r14,1)
   f:	74 08                	je     0x19
  11:	4c 89 e7             	mov    %r12,%rdi
  14:	e8 ae 3a 94 ff       	call   0xff943ac7
  19:	41 bf 48 07 00 00    	mov    $0x748,%r15d
  1f:	4d 03 3c 24          	add    (%r12),%r15
  23:	4c 89 f8             	mov    %r15,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 30       	movzbl (%rax,%r14,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 41 05 00 00    	jne    0x578
  37:	45 8b 3f             	mov    (%r15),%r15d
  3a:	44 89 fe             	mov    %r15d,%esi
  3d:	81                   	.byte 0x81
  3e:	e6 00                	out    %al,$0x0

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/07 17:29 android13-5.15-lts d6c8aee048e0 6520ecdb .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in f2fs_release_page
2026/09/11 19:10 android13-5.15-lts 45bb2952b61c b6a5eeb7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in f2fs_release_page
* Struck through repros no longer work on HEAD.