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program crashed: KASAN: use-after-free Read in ocfs2_search_extent_list single: successfully extracted reproducer found reproducer with 1 syscalls minimizing guilty program extracting C reproducer testing compiled C program (duration=1m40s, {Threaded:true Repeat:true RepeatTimes:0 Procs:6 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_mount_image$ocfs2 program crashed: KASAN: use-after-free Read in ocfs2_search_extent_list simplifying C reproducer testing compiled C program (duration=1m40s, {Threaded:false Repeat:true RepeatTimes:0 Procs:6 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_mount_image$ocfs2 program crashed: KASAN: use-after-free Read in ocfs2_search_extent_list testing compiled C program (duration=1m40s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_mount_image$ocfs2 program crashed: KASAN: use-after-free Read in ocfs2_search_extent_list testing compiled C program (duration=1m40s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:true Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_mount_image$ocfs2 program crashed: KASAN: use-after-free Read in ocfs2_search_extent_list testing compiled C program (duration=1m40s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_mount_image$ocfs2 program crashed: KASAN: use-after-free Read in ocfs2_search_extent_list testing compiled C program (duration=1m40s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_mount_image$ocfs2 program crashed: KASAN: use-after-free Read in ocfs2_search_extent_list testing compiled C program (duration=1m40s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:false Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_mount_image$ocfs2 program crashed: KASAN: use-after-free Read in ocfs2_search_extent_list testing compiled C program (duration=1m40s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_mount_image$ocfs2 program crashed: KASAN: use-after-free Read in ocfs2_search_extent_list reproducing took 8m5.093642678s repro crashed as (corrupted=false): loop0: detected capacity change from 0 to 32768 JBD2: Ignoring recovery information on journal ================================================================== BUG: KASAN: use-after-free in ocfs2_search_extent_list+0x155/0x200 fs/ocfs2/alloc.c:776 Read of size 4 at addr ffff888049800000 by task syz-executor307/5410 CPU: 0 UID: 0 PID: 5410 Comm: syz-executor307 Not tainted 6.13.0-rc1-syzkaller-00036-g5076001689e4 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x169/0x550 mm/kasan/report.c:489 kasan_report+0x143/0x180 mm/kasan/report.c:602 ocfs2_search_extent_list+0x155/0x200 fs/ocfs2/alloc.c:776 ocfs2_get_clusters_nocache+0x21a/0xbf0 fs/ocfs2/extent_map.c:438 ocfs2_get_clusters+0x5bd/0xbd0 fs/ocfs2/extent_map.c:621 ocfs2_extent_map_get_blocks+0x24c/0x7d0 fs/ocfs2/extent_map.c:668 ocfs2_bmap+0x2b7/0x780 fs/ocfs2/aops.c:474 bmap+0xa8/0xe0 fs/inode.c:1997 jbd2_journal_bmap+0x12d/0x2b0 fs/jbd2/journal.c:926 do_readahead fs/jbd2/recovery.c:88 [inline] jread+0x435/0xc80 fs/jbd2/recovery.c:165 do_one_pass+0x3cd/0x3aa0 fs/jbd2/recovery.c:646 jbd2_journal_skip_recovery+0x95/0x240 fs/jbd2/recovery.c:366 jbd2_journal_wipe+0xc9/0x110 fs/jbd2/journal.c:2517 ocfs2_journal_wipe+0xab/0x2a0 fs/ocfs2/journal.c:1192 ocfs2_check_volume fs/ocfs2/super.c:2413 [inline] ocfs2_mount_volume+0xb86/0x1940 fs/ocfs2/super.c:1817 ocfs2_fill_super+0x476e/0x5760 fs/ocfs2/super.c:1084 mount_bdev+0x20a/0x2d0 fs/super.c:1693 legacy_get_tree+0xee/0x190 fs/fs_context.c:662 vfs_get_tree+0x90/0x2b0 fs/super.c:1814 do_new_mount+0x2be/0xb40 fs/namespace.c:3507 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4057 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4034 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fdc66ec71aa Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffee9a2de18 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffee9a2de30 RCX: 00007fdc66ec71aa RDX: 0000000020004440 RSI: 0000000020000040 RDI: 00007ffee9a2de30 RBP: 0000000000000004 R08: 00007ffee9a2de70 R09: 0000000000004431 R10: 00000000000008c0 R11: 0000000000000282 R12: 00000000000008c0 R13: 00007ffee9a2de70 R14: 0000000000000003 R15: 0000000001000000 The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x49800 flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff) page_type: f0(buddy) raw: 04fff00000000000 ffff88805ffd7230 ffff88805ffd7230 0000000000000000 raw: 0000000000000000 000000000000000a 00000000f0000000 0000000000000000 page dumped because: kasan: bad access detected page_owner info is not present (never set?) Memory state around the buggy address: ffff8880497fff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880497fff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888049800000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888049800080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888049800100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== final repro crashed as (corrupted=false): loop0: detected capacity change from 0 to 32768 JBD2: Ignoring recovery information on journal ================================================================== BUG: KASAN: use-after-free in ocfs2_search_extent_list+0x155/0x200 fs/ocfs2/alloc.c:776 Read of size 4 at addr ffff888049800000 by task syz-executor307/5410 CPU: 0 UID: 0 PID: 5410 Comm: syz-executor307 Not tainted 6.13.0-rc1-syzkaller-00036-g5076001689e4 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x169/0x550 mm/kasan/report.c:489 kasan_report+0x143/0x180 mm/kasan/report.c:602 ocfs2_search_extent_list+0x155/0x200 fs/ocfs2/alloc.c:776 ocfs2_get_clusters_nocache+0x21a/0xbf0 fs/ocfs2/extent_map.c:438 ocfs2_get_clusters+0x5bd/0xbd0 fs/ocfs2/extent_map.c:621 ocfs2_extent_map_get_blocks+0x24c/0x7d0 fs/ocfs2/extent_map.c:668 ocfs2_bmap+0x2b7/0x780 fs/ocfs2/aops.c:474 bmap+0xa8/0xe0 fs/inode.c:1997 jbd2_journal_bmap+0x12d/0x2b0 fs/jbd2/journal.c:926 do_readahead fs/jbd2/recovery.c:88 [inline] jread+0x435/0xc80 fs/jbd2/recovery.c:165 do_one_pass+0x3cd/0x3aa0 fs/jbd2/recovery.c:646 jbd2_journal_skip_recovery+0x95/0x240 fs/jbd2/recovery.c:366 jbd2_journal_wipe+0xc9/0x110 fs/jbd2/journal.c:2517 ocfs2_journal_wipe+0xab/0x2a0 fs/ocfs2/journal.c:1192 ocfs2_check_volume fs/ocfs2/super.c:2413 [inline] ocfs2_mount_volume+0xb86/0x1940 fs/ocfs2/super.c:1817 ocfs2_fill_super+0x476e/0x5760 fs/ocfs2/super.c:1084 mount_bdev+0x20a/0x2d0 fs/super.c:1693 legacy_get_tree+0xee/0x190 fs/fs_context.c:662 vfs_get_tree+0x90/0x2b0 fs/super.c:1814 do_new_mount+0x2be/0xb40 fs/namespace.c:3507 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4057 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4034 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fdc66ec71aa Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffee9a2de18 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffee9a2de30 RCX: 00007fdc66ec71aa RDX: 0000000020004440 RSI: 0000000020000040 RDI: 00007ffee9a2de30 RBP: 0000000000000004 R08: 00007ffee9a2de70 R09: 0000000000004431 R10: 00000000000008c0 R11: 0000000000000282 R12: 00000000000008c0 R13: 00007ffee9a2de70 R14: 0000000000000003 R15: 0000000001000000 The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x49800 flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff) page_type: f0(buddy) raw: 04fff00000000000 ffff88805ffd7230 ffff88805ffd7230 0000000000000000 raw: 0000000000000000 000000000000000a 00000000f0000000 0000000000000000 page dumped because: kasan: bad access detected page_owner info is not present (never set?) Memory state around the buggy address: ffff8880497fff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880497fff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888049800000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888049800080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888049800100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================