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r0 = openat(0xffffffffffffff9c, &(0x7f0000000080)='./file1\x00', 0x105042, 0x1db) pwrite64(r0, &(0x7f0000000000)="e3", 0x1, 0xffff) openat(0xffffffffffffff9c, &(0x7f0000000200)='./bus\x00', 0x141842, 0x0) mount(&(0x7f0000000380)=@loop={'/dev/loop', 0x0}, &(0x7f0000000340)='./bus\x00', 0x0, 0x1000, 0x0) r1 = open(&(0x7f00000005c0)='./bus\x00', 0x0, 0x0) ioctl$FS_IOC_SETFLAGS(r1, 0x4c02, &(0x7f0000000140)) openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000280)='memory.numa_stat\x00', 0x275a, 0x0) r2 = fspick(0xffffffffffffff9c, &(0x7f0000000000)='.\x00', 0x0) fsconfig$FSCONFIG_CMD_RECONFIGURE(r2, 0x7, 0x0, 0x0, 0x0) syz_mount_image$msdos(&(0x7f0000000f40), &(0x7f0000000f00)='.\x00', 0x1a4a438, &(0x7f00000008c0)=ANY=[], 0xb, 0x0, &(0x7f0000000000)) [ 89.227058][ T5099] Bluetooth: hci0: command tx timeout [ 90.882570][ T5115] loop0: detected capacity change from 0 to 32768 [ 90.922434][ T5115] BTRFS: device fsid c9fe44da-de57-406a-8241-57ec7d4412cf devid 1 transid 8 /dev/loop0 (7:0) scanned by syz.0.0 (5115) [ 90.974386][ T5115] BTRFS info (device loop0): first mount of filesystem c9fe44da-de57-406a-8241-57ec7d4412cf [ 90.978159][ T5115] BTRFS info (device loop0): using crc32c (crc32c-intel) checksum algorithm [ 90.992872][ T5115] BTRFS info (device loop0): using free-space-tree [ 91.075390][ T24] audit: type=1800 audit(1726489585.224:2): pid=5115 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed(directio) comm="syz.0.0" name="file1" dev="loop0" ino=260 res=0 errno=0 [ 91.192837][ T5115] loop0: detected capacity change from 32768 to 0 [ 91.213838][ T1031] kworker/u4:7: attempt to access beyond end of device [ 91.213838][ T1031] loop0: rw=4097, sector=10440, nr_sectors = 8 limit=0 [ 91.231998][ T1031] BTRFS error (device loop0): bdev /dev/loop0 errs: wr 1, rd 0, flush 0, corrupt 0, gen 0 [ 91.236470][ T1031] kworker/u4:7: attempt to access beyond end of device [ 91.236470][ T1031] loop0: rw=4097, sector=10472, nr_sectors = 8 limit=0 [ 91.261237][ T1031] BTRFS error (device loop0): bdev /dev/loop0 errs: wr 2, rd 0, flush 0, corrupt 0, gen 0 [ 91.273763][ T5099] Bluetooth: hci0: command tx timeout [ 91.275861][ T1031] kworker/u4:7: attempt to access beyond end of device [ 91.275861][ T1031] loop0: rw=4097, sector=10480, nr_sectors = 8 limit=0 [ 91.280109][ T1031] BTRFS error (device loop0): bdev /dev/loop0 errs: wr 3, rd 0, flush 0, corrupt 0, gen 0 [ 91.296288][ T1031] kworker/u4:7: attempt to access beyond end of device [ 91.296288][ T1031] loop0: rw=4097, sector=10488, nr_sectors = 8 limit=0 [ 91.321071][ T1031] BTRFS error (device loop0): bdev /dev/loop0 errs: wr 4, rd 0, flush 0, corrupt 0, gen 0 [ 91.325155][ T1031] kworker/u4:7: attempt to access beyond end of device [ 91.325155][ T1031] loop0: rw=4097, sector=10496, nr_sectors = 8 limit=0 [ 91.349978][ T1031] BTRFS error (device loop0): bdev /dev/loop0 errs: wr 5, rd 0, flush 0, corrupt 0, gen 0 [ 91.370539][ T1031] kworker/u4:7: attempt to access beyond end of device [ 91.370539][ T1031] loop0: rw=4097, sector=10504, nr_sectors = 8 limit=0 [ 91.381762][ T1031] BTRFS error (device loop0): bdev /dev/loop0 errs: wr 6, rd 0, flush 0, corrupt 0, gen 0 [ 91.403064][ T5115] BTRFS error (device loop0 state A): Transaction aborted (error -5) [ 91.406430][ T5115] BTRFS: error (device loop0 state A) in btrfs_start_dirty_block_groups:3462: errno=-5 IO failure [ 91.409967][ T5115] BTRFS info (device loop0 state EA): forced readonly [ 91.432047][ T5115] BTRFS error (device loop0 state EMA): remounting read-write after error is not allowed [ 91.440816][ T5116] BTRFS error (device loop0 state EMA): remounting read-write after error is not allowed [ 91.448638][ T5116] ================================================================== [ 91.451255][ T5116] BUG: KASAN: slab-use-after-free in rb_first_postorder+0x69/0x90 [ 91.453685][ T5116] Read of size 8 at addr ffff88804ac11010 by task syz.0.0/5116 [ 91.456064][ T5116] [ 91.456817][ T5116] CPU: 0 UID: 0 PID: 5116 Comm: syz.0.0 Not tainted 6.11.0-syzkaller-02520-gadfc3ded5c33 #0 [ 91.459705][ T5116] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 [ 91.462754][ T5116] Call Trace: [ 91.463761][ T5116] [ 91.464750][ T5116] dump_stack_lvl+0x241/0x360 [ 91.466186][ T5116] ? __pfx_dump_stack_lvl+0x10/0x10 [ 91.467708][ T5116] ? __pfx__printk+0x10/0x10 [ 91.469037][ T5116] ? _printk+0xd5/0x120 [ 91.470254][ T5116] ? __virt_addr_valid+0x183/0x530 [ 91.471751][ T5116] ? __virt_addr_valid+0x183/0x530 [ 91.473221][ T5116] print_report+0x169/0x550 [ 91.474578][ T5116] ? __virt_addr_valid+0x183/0x530 [ 91.476029][ T5116] ? __virt_addr_valid+0x183/0x530 [ 91.477471][ T5116] ? __virt_addr_valid+0x45f/0x530 [ 91.479011][ T5116] ? __phys_addr+0xba/0x170 [ 91.480350][ T5116] ? rb_first_postorder+0x69/0x90 [ 91.481820][ T5116] kasan_report+0x143/0x180 [ 91.483159][ T5116] ? rb_first_postorder+0x69/0x90 [ 91.484640][ T5116] rb_first_postorder+0x69/0x90 [ 91.486095][ T5116] btrfs_cleanup_defrag_inodes+0x2f/0x80 [ 91.487897][ T5116] btrfs_reconfigure+0x269c/0x2d40 [ 91.489414][ T5116] ? __pfx_btrfs_reconfigure+0x10/0x10 [ 91.491112][ T5116] ? __pfx_shrink_dcache_sb+0x10/0x10 [ 91.492675][ T5116] ? __pfx_generic_parse_monolithic+0x10/0x10 [ 91.494524][ T5116] ? bpf_lsm_sb_remount+0x9/0x10 [ 91.495989][ T5116] reconfigure_super+0x445/0x880 [ 91.497505][ T5116] path_mount+0xc22/0xfa0 [ 91.498820][ T5116] __se_sys_mount+0x2d6/0x3c0 [ 91.500176][ T5116] ? __pfx___se_sys_mount+0x10/0x10 [ 91.501709][ T5116] ? do_syscall_64+0x100/0x230 [ 91.503121][ T5116] ? __x64_sys_mount+0x20/0xc0 [ 91.504528][ T5116] do_syscall_64+0xf3/0x230 [ 91.505875][ T5116] ? clear_bhb_loop+0x35/0x90 [ 91.507540][ T5116] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 91.509217][ T5116] RIP: 0033:0x7fe08017f69a [ 91.510548][ T5116] Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 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 a8 ff ff ff f7 d8 64 89 01 48 [ 91.516012][ T5116] RSP: 002b:00007fe080edde68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [ 91.518465][ T5116] RAX: ffffffffffffffda RBX: 00007fe080eddef0 RCX: 00007fe08017f69a [ 91.520794][ T5116] RDX: 0000000020000f40 RSI: 0000000020000f00 RDI: 0000000000000000 [ 91.523071][ T5116] RBP: 0000000020000f40 R08: 00007fe080eddef0 R09: 0000000001a4a438 [ 91.525390][ T5116] R10: 0000000001a4a438 R11: 0000000000000246 R12: 0000000020000f00 [ 91.527716][ T5116] R13: 00007fe080eddeb0 R14: 0000000000000000 R15: 00000000200008c0 [ 91.530145][ T5116] [ 91.531074][ T5116] [ 91.531815][ T5116] Allocated by task 5115: [ 91.533109][ T5116] kasan_save_track+0x3f/0x80 [ 91.534638][ T5116] __kasan_slab_alloc+0x66/0x80 [ 91.536090][ T5116] kmem_cache_alloc_noprof+0x135/0x2a0 [ 91.537851][ T5116] btrfs_add_inode_defrag+0x15c/0x790 [ 91.539693][ T5116] cow_file_range+0x380/0x11f0 [ 91.541313][ T5116] btrfs_run_delalloc_range+0x33d/0xf70 [ 91.543297][ T5116] writepage_delalloc+0x482/0x7d0 [ 91.545114][ T5116] btrfs_writepages+0x1157/0x2370 [ 91.546810][ T5116] do_writepages+0x35d/0x870 [ 91.548359][ T5116] filemap_fdatawrite_wbc+0x125/0x180 [ 91.550145][ T5116] filemap_fdatawrite_range+0x120/0x180 [ 91.551906][ T5116] btrfs_fdatawrite_range+0x53/0xe0 [ 91.553707][ T5116] btrfs_direct_write+0x565/0xa70 [ 91.555441][ T5116] btrfs_do_write_iter+0x2a0/0x760 [ 91.557022][ T5116] vfs_write+0xa6d/0xc90 [ 91.558462][ T5116] __x64_sys_pwrite64+0x1aa/0x230 [ 91.560211][ T5116] do_syscall_64+0xf3/0x230 [ 91.561836][ T5116] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 91.563958][ T5116] [ 91.564834][ T5116] Freed by task 5115: [ 91.566321][ T5116] kasan_save_track+0x3f/0x80 [ 91.567762][ T5116] kasan_save_free_info+0x40/0x50 [ 91.569404][ T5116] poison_slab_object+0xe0/0x150 [ 91.571306][ T5116] __kasan_slab_free+0x37/0x60 [ 91.573133][ T5116] kmem_cache_free+0x145/0x350 [ 91.574821][ T5116] btrfs_cleanup_defrag_inodes+0x51/0x80 [ 91.576631][ T5116] btrfs_reconfigure+0x269c/0x2d40 [ 91.578518][ T5116] reconfigure_super+0x445/0x880 [ 91.580343][ T5116] __se_sys_fsconfig+0xb68/0xf70 [ 91.582225][ T5116] do_syscall_64+0xf3/0x230 [ 91.583934][ T5116] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 91.586164][ T5116] [ 91.587039][ T5116] The buggy address belongs to the object at ffff88804ac11000 [ 91.587039][ T5116] which belongs to the cache btrfs_inode_defrag of size 56 [ 91.592099][ T5116] The buggy address is located 16 bytes inside of [ 91.592099][ T5116] freed 56-byte region [ffff88804ac11000, ffff88804ac11038) [ 91.597259][ T5116] [ 91.598208][ T5116] The buggy address belongs to the physical page: [ 91.600619][ T5116] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4ac11 [ 91.603938][ T5116] flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff) [ 91.606658][ T5116] page_type: 0xfdffffff(slab) [ 91.608471][ T5116] raw: 04fff00000000000 ffff88803d4c0a00 dead000000000122 0000000000000000 [ 91.611753][ T5116] raw: 0000000000000000 00000000802e002e 00000001fdffffff 0000000000000000 [ 91.614991][ T5116] page dumped because: kasan: bad access detected [ 91.617400][ T5116] page_owner tracks the page as allocated [ 91.619533][ T5116] page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5115, tgid 5114 (syz.0.0), ts 91102950206, free_ts 90281627083 [ 91.626316][ T5116] post_alloc_hook+0x1f3/0x230 [ 91.628234][ T5116] get_page_from_freelist+0x2e4c/0x2f10 [ 91.630419][ T5116] __alloc_pages_noprof+0x256/0x6c0 [ 91.632460][ T5116] alloc_slab_page+0x5f/0x120 [ 91.634301][ T5116] allocate_slab+0x5a/0x2f0 [ 91.636112][ T5116] ___slab_alloc+0xcd1/0x14b0 [ 91.637877][ T5116] __slab_alloc+0x58/0xa0 [ 91.639504][ T5116] kmem_cache_alloc_noprof+0x1c1/0x2a0 [ 91.641415][ T5116] btrfs_add_inode_defrag+0x15c/0x790 [ 91.643338][ T5116] cow_file_range+0x380/0x11f0 [ 91.645070][ T5116] btrfs_run_delalloc_range+0x33d/0xf70 [ 91.647096][ T5116] writepage_delalloc+0x482/0x7d0 [ 91.648922][ T5116] btrfs_writepages+0x1157/0x2370 [ 91.650768][ T5116] do_writepages+0x35d/0x870 [ 91.652473][ T5116] filemap_fdatawrite_wbc+0x125/0x180 [ 91.654586][ T5116] filemap_fdatawrite_range+0x120/0x180 [ 91.656691][ T5116] page last free pid 5101 tgid 5101 stack trace: [ 91.659066][ T5116] free_unref_folios+0x103a/0x1b00 [ 91.660994][ T5116] folios_put_refs+0x76e/0x860 [ 91.662891][ T5116] free_pages_and_swap_cache+0x5c8/0x690 [ 91.665052][ T5116] tlb_flush_mmu+0x3a3/0x680 [ 91.666789][ T5116] tlb_finish_mmu+0xd4/0x200 [ 91.668594][ T5116] exit_mmap+0x44f/0xc80 [ 91.670020][ T5116] __mmput+0x115/0x390 [ 91.671354][ T5116] exit_mm+0x220/0x310 [ 91.672790][ T5116] do_exit+0x9b2/0x27f0 [ 91.674416][ T5116] do_group_exit+0x207/0x2c0 [ 91.676164][ T5116] __x64_sys_exit_group+0x3f/0x40 [ 91.678000][ T5116] x64_sys_call+0x2634/0x2640 [ 91.679823][ T5116] do_syscall_64+0xf3/0x230 [ 91.681527][ T5116] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 91.683724][ T5116] [ 91.684657][ T5116] Memory state around the buggy address: [ 91.686718][ T5116] ffff88804ac10f00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 91.689492][ T5116] ffff88804ac10f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 91.692468][ T5116] >ffff88804ac11000: fa fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc [ 91.695478][ T5116] ^ [ 91.697269][ T5116] ffff88804ac11080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 91.700286][ T5116] ffff88804ac11100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 91.703166][ T5116] ================================================================== [ 91.706824][ T5116] Kernel panic - not syncing: KASAN: panic_on_warn set ... [ 91.709448][ T5116] CPU: 0 UID: 0 PID: 5116 Comm: syz.0.0 Not tainted 6.11.0-syzkaller-02520-gadfc3ded5c33 #0 [ 91.713128][ T5116] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 [ 91.717167][ T5116] Call Trace: [ 91.718447][ T5116] [ 91.719558][ T5116] dump_stack_lvl+0x241/0x360 [ 91.721431][ T5116] ? __pfx_dump_stack_lvl+0x10/0x10 [ 91.723468][ T5116] ? __pfx__printk+0x10/0x10 [ 91.725165][ T5116] ? lock_release+0xbf/0xa30 [ 91.726879][ T5116] ? vscnprintf+0x5d/0x90 [ 91.728526][ T5116] panic+0x349/0x860 [ 91.730126][ T5116] ? check_panic_on_warn+0x21/0xb0 [ 91.732063][ T5116] ? __pfx_panic+0x10/0x10 [ 91.733696][ T5116] ? mark_lock+0x9a/0x350 [ 91.735198][ T5116] ? _raw_spin_unlock_irqrestore+0xd8/0x140 [ 91.737351][ T5116] ? _raw_spin_unlock_irqrestore+0xdd/0x140 [ 91.739624][ T5116] ? __pfx__raw_spin_unlock_irqrestore+0x10/0x10 [ 91.742097][ T5116] ? print_report+0x502/0x550 [ 91.743821][ T5116] check_panic_on_warn+0x86/0xb0 [ 91.745726][ T5116] ? rb_first_postorder+0x69/0x90 [ 91.747676][ T5116] end_report+0x77/0x160 [ 91.749322][ T5116] kasan_report+0x154/0x180 [ 91.751021][ T5116] ? rb_first_postorder+0x69/0x90 [ 91.752905][ T5116] rb_first_postorder+0x69/0x90 [ 91.754831][ T5116] btrfs_cleanup_defrag_inodes+0x2f/0x80 [ 91.756858][ T5116] btrfs_reconfigure+0x269c/0x2d40 [ 91.758838][ T5116] ? __pfx_btrfs_reconfigure+0x10/0x10 [ 91.760979][ T5116] ? __pfx_shrink_dcache_sb+0x10/0x10 [ 91.762971][ T5116] ? __pfx_generic_parse_monolithic+0x10/0x10 [ 91.765252][ T5116] ? bpf_lsm_sb_remount+0x9/0x10 [ 91.767197][ T5116] reconfigure_super+0x445/0x880 [ 91.769157][ T5116] path_mount+0xc22/0xfa0 [ 91.770757][ T5116] __se_sys_mount+0x2d6/0x3c0 [ 91.772518][ T5116] ? __pfx___se_sys_mount+0x10/0x10 [ 91.774588][ T5116] ? do_syscall_64+0x100/0x230 [ 91.776179][ T5116] ? __x64_sys_mount+0x20/0xc0 [ 91.777492][ T5116] do_syscall_64+0xf3/0x230 [ 91.778799][ T5116] ? clear_bhb_loop+0x35/0x90 [ 91.780165][ T5116] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 91.781913][ T5116] RIP: 0033:0x7fe08017f69a [ 91.783222][ T5116] Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 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 a8 ff ff ff f7 d8 64 89 01 48 [ 91.788785][ T5116] RSP: 002b:00007fe080edde68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [ 91.791249][ T5116] RAX: ffffffffffffffda RBX: 00007fe080eddef0 RCX: 00007fe08017f69a [ 91.793913][ T5116] RDX: 0000000020000f40 RSI: 0000000020000f00 RDI: 0000000000000000 [ 91.796322][ T5116] RBP: 0000000020000f40 R08: 00007fe080eddef0 R09: 0000000001a4a438 [ 91.798775][ T5116] R10: 0000000001a4a438 R11: 0000000000000246 R12: 0000000020000f00 [ 91.801264][ T5116] R13: 00007fe080eddeb0 R14: 0000000000000000 R15: 00000000200008c0 [ 91.804012][ T5116] [ 91.805326][ T5116] Kernel Offset: disabled [ 91.806877][ T5116] Rebooting in 86400 seconds..