bcachefs (loop4): insufficient writeable journal devices available: have 0, need 1 rw journal devs: ================================================================== BUG: KASAN: slab-use-after-free in bch2_get_next_online_dev+0x2c4/0x42c fs/bcachefs/sb-members.h:154 Read of size 1 at addr ffff0000f41ac13e by task kworker/u9:3/6427 CPU: 1 UID: 0 PID: 6427 Comm: kworker/u9:3 Not tainted 6.12.0-rc6-syzkaller-g8936d33c1f69 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: bcachefs_journal bch2_journal_write Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:484 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:377 [inline] print_report+0x198/0x538 mm/kasan/report.c:488 kasan_report+0xd8/0x138 mm/kasan/report.c:601 __asan_report_load1_noabort+0x20/0x2c mm/kasan/report_generic.c:378 bch2_get_next_online_dev+0x2c4/0x42c fs/bcachefs/sb-members.h:154 bch2_journal_write+0x184/0x358c fs/bcachefs/journal_io.c:1982 process_one_work+0x7bc/0x1600 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x97c/0xeec kernel/workqueue.c:3391 kthread+0x288/0x310 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 Allocated by task 6727: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:565 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:257 [inline] __kmalloc_cache_noprof+0x244/0x378 mm/slub.c:4295 kmalloc_noprof include/linux/slab.h:878 [inline] kzalloc_noprof include/linux/slab.h:1014 [inline] __bch2_dev_alloc+0x6c/0x844 fs/bcachefs/super.c:1303 bch2_dev_alloc+0xc4/0x154 fs/bcachefs/super.c:1373 bch2_fs_alloc fs/bcachefs/super.c:938 [inline] bch2_fs_open+0x26cc/0x27c4 fs/bcachefs/super.c:2064 bch2_fs_get_tree+0x53c/0x1030 fs/bcachefs/fs.c:2157 vfs_get_tree+0x90/0x28c fs/super.c:1814 do_new_mount+0x278/0x900 fs/namespace.c:3507 path_mount+0x590/0xe04 fs/namespace.c:3834 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4057 [inline] __se_sys_mount fs/namespace.c:4034 [inline] __arm64_sys_mount+0x4d4/0x5ac fs/namespace.c:4034 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Freed by task 6422: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_free_info+0x54/0x6c mm/kasan/generic.c:579 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x64/0x8c mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:2342 [inline] slab_free mm/slub.c:4579 [inline] kfree+0x184/0x47c mm/slub.c:4727 bch2_dev_release+0x20/0x30 fs/bcachefs/super.c:1182 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x2a8/0x41c lib/kobject.c:737 bch2_dev_free+0x1a0/0x214 fs/bcachefs/super.c:1209 bch2_fs_free+0x208/0x334 fs/bcachefs/super.c:666 bch2_kill_sb+0x48/0x58 fs/bcachefs/fs.c:2279 deactivate_locked_super+0xc4/0x12c fs/super.c:473 deactivate_super+0xe0/0x100 fs/super.c:506 cleanup_mnt+0x34c/0x3dc fs/namespace.c:1373 __cleanup_mnt+0x20/0x30 fs/namespace.c:1380 task_work_run+0x230/0x2e0 kernel/task_work.c:239 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] do_notify_resume+0x178/0x1f4 arch/arm64/kernel/entry-common.c:151 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline] el0_svc+0xac/0x168 arch/arm64/kernel/entry-common.c:745 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Last potentially related work creation: kasan_save_stack+0x40/0x6c mm/kasan/common.c:47 __kasan_record_aux_stack+0xd0/0xec mm/kasan/generic.c:541 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:551 insert_work+0x54/0x2d4 kernel/workqueue.c:2183 __queue_work+0xe20/0x1308 kernel/workqueue.c:2339 queue_work_on+0xe0/0x1a0 kernel/workqueue.c:2390 queue_work include/linux/workqueue.h:662 [inline] bch2_dev_do_invalidates+0x14c/0x1bc fs/bcachefs/alloc_background.c:2171 bch2_do_invalidates+0x34/0x6c fs/bcachefs/alloc_background.c:2182 __bch2_fs_read_write+0x370/0x434 fs/bcachefs/super.c:499 bch2_fs_read_write_early+0x9c/0xc8 fs/bcachefs/super.c:527 bch2_set_may_go_rw+0x1a0/0x28c fs/bcachefs/recovery_passes.c:44 bch2_run_recovery_pass+0xe4/0x1d4 fs/bcachefs/recovery_passes.c:185 bch2_run_recovery_passes+0x430/0x71c fs/bcachefs/recovery_passes.c:232 bch2_fs_recovery+0x32d8/0x55a0 fs/bcachefs/recovery.c:861 bch2_fs_start+0x30c/0x53c fs/bcachefs/super.c:1036 bch2_fs_get_tree+0x938/0x1030 fs/bcachefs/fs.c:2170 vfs_get_tree+0x90/0x28c fs/super.c:1814 do_new_mount+0x278/0x900 fs/namespace.c:3507 path_mount+0x590/0xe04 fs/namespace.c:3834 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4057 [inline] __se_sys_mount fs/namespace.c:4034 [inline] __arm64_sys_mount+0x4d4/0x5ac fs/namespace.c:4034 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Second to last potentially related work creation: kasan_save_stack+0x40/0x6c mm/kasan/common.c:47 __kasan_record_aux_stack+0xd0/0xec mm/kasan/generic.c:541 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:551 insert_work+0x54/0x2d4 kernel/workqueue.c:2183 __queue_work+0xe20/0x1308 kernel/workqueue.c:2339 queue_work_on+0xe0/0x1a0 kernel/workqueue.c:2390 queue_work include/linux/workqueue.h:662 [inline] bch2_dev_do_discards+0x14c/0x1bc fs/bcachefs/alloc_background.c:1912 bch2_do_discards+0x34/0x6c fs/bcachefs/alloc_background.c:1923 __bch2_fs_read_write+0x368/0x434 fs/bcachefs/super.c:498 bch2_fs_read_write_early+0x9c/0xc8 fs/bcachefs/super.c:527 bch2_set_may_go_rw+0x1a0/0x28c fs/bcachefs/recovery_passes.c:44 bch2_run_recovery_pass+0xe4/0x1d4 fs/bcachefs/recovery_passes.c:185 bch2_run_recovery_passes+0x430/0x71c fs/bcachefs/recovery_passes.c:232 bch2_fs_recovery+0x32d8/0x55a0 fs/bcachefs/recovery.c:861 bch2_fs_start+0x30c/0x53c fs/bcachefs/super.c:1036 bch2_fs_get_tree+0x938/0x1030 fs/bcachefs/fs.c:2170 vfs_get_tree+0x90/0x28c fs/super.c:1814 do_new_mount+0x278/0x900 fs/namespace.c:3507 path_mount+0x590/0xe04 fs/namespace.c:3834 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4057 [inline] __se_sys_mount fs/namespace.c:4034 [inline] __arm64_sys_mount+0x4d4/0x5ac fs/namespace.c:4034 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 The buggy address belongs to the object at ffff0000f41ac000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 318 bytes inside of freed 4096-byte region [ffff0000f41ac000, ffff0000f41ad000) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1341a8 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000040 ffff0000c0002140 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000040004 00000001f5000000 0000000000000000 head: 05ffc00000000040 ffff0000c0002140 dead000000000122 0000000000000000 head: 0000000000000000 0000000000040004 00000001f5000000 0000000000000000 head: 05ffc00000000003 fffffdffc3d06a01 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000f41ac000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000f41ac080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000f41ac100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000f41ac180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000f41ac200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== Unable to handle kernel paging request at virtual address dfff800000000000 KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] Mem abort info: ESR = 0x0000000096000005 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x05: level 1 translation fault Data abort info: ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [dfff800000000000] address between user and kernel address ranges Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP Modules linked in: CPU: 1 UID: 0 PID: 6427 Comm: kworker/u9:3 Tainted: G B 6.12.0-rc6-syzkaller-g8936d33c1f69 #0 Tainted: [B]=BAD_PAGE Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: bcachefs_journal bch2_journal_write pstate: a0400005 (NzCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : raw_atomic64_read include/linux/atomic/atomic-arch-fallback.h:2583 [inline] pc : raw_atomic64_fetch_add_unless include/linux/atomic/atomic-arch-fallback.h:4552 [inline] pc : raw_atomic64_add_unless include/linux/atomic/atomic-arch-fallback.h:4582 [inline] pc : raw_atomic_long_add_unless include/linux/atomic/atomic-long.h:1721 [inline] pc : atomic_long_add_unless include/linux/atomic/atomic-instrumented.h:4674 [inline] pc : percpu_ref_tryget_many include/linux/percpu-refcount.h:247 [inline] pc : percpu_ref_tryget+0x268/0x360 include/linux/percpu-refcount.h:266 lr : instrument_atomic_read_write include/linux/instrumented.h:96 [inline] lr : atomic_long_add_unless include/linux/atomic/atomic-instrumented.h:4673 [inline] lr : percpu_ref_tryget_many include/linux/percpu-refcount.h:247 [inline] lr : percpu_ref_tryget+0x264/0x360 include/linux/percpu-refcount.h:266 sp : ffff8000a3c97640 x29: ffff8000a3c97640 x28: 0000000000000001 x27: ffff0000e84003d0 x26: 0000000000000000 x25: dfff800000000000 x24: ffff800092aa2000 x23: 0000000000000007 x22: ffff0000e84003d0 x21: dfff800000000000 x20: 0000000000000003 x19: 0000000000000000 x18: 0000000000000008 x17: 0000000000000000 x16: ffff80008b4b2ccc x15: 0000000000000001 x14: 1ffff000125a24e8 x13: 0000000000000000 x12: ffff8000a3c97520 x11: ffff80008035f1d8 x10: fffffffffffffff8 x9 : ffff80009739c3a0 x8 : 0000000000000000 x7 : 0000000000000001 x6 : ffff800082a0b67c x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000829ff8d8 x2 : 0000000000000001 x1 : 0000000000000008 x0 : 0000000000000001 Call trace: raw_atomic64_read include/linux/atomic/atomic-arch-fallback.h:2583 [inline] (P) raw_atomic64_fetch_add_unless include/linux/atomic/atomic-arch-fallback.h:4552 [inline] (P) raw_atomic64_add_unless include/linux/atomic/atomic-arch-fallback.h:4582 [inline] (P) raw_atomic_long_add_unless include/linux/atomic/atomic-long.h:1721 [inline] (P) atomic_long_add_unless include/linux/atomic/atomic-instrumented.h:4674 [inline] (P) percpu_ref_tryget_many include/linux/percpu-refcount.h:247 [inline] (P) percpu_ref_tryget+0x268/0x360 include/linux/percpu-refcount.h:266 (P) instrument_atomic_read_write include/linux/instrumented.h:96 [inline] (L) atomic_long_add_unless include/linux/atomic/atomic-instrumented.h:4673 [inline] (L) percpu_ref_tryget_many include/linux/percpu-refcount.h:247 [inline] (L) percpu_ref_tryget+0x264/0x360 include/linux/percpu-refcount.h:266 (L) bch2_get_next_online_dev+0x28c/0x42c fs/bcachefs/sb-members.h:155 bch2_journal_write+0x184/0x358c fs/bcachefs/journal_io.c:1982 process_one_work+0x7bc/0x1600 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x97c/0xeec kernel/workqueue.c:3391 kthread+0x288/0x310 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 Code: 52800101 aa1303e0 97833787 d343fe68 (38756908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 52800101 mov w1, #0x8 // #8 4: aa1303e0 mov x0, x19 8: 97833787 bl 0xfffffffffe0cde24 c: d343fe68 lsr x8, x19, #3 * 10: 38756908 ldrb w8, [x8, x21] <-- trapping instruction