loop0: detected capacity change from 0 to 1024 ------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(1) WARNING: CPU: 1 PID: 7271 at kernel/locking/lockdep.c:237 hlock_class kernel/locking/lockdep.c:-1 [inline] WARNING: CPU: 1 PID: 7271 at kernel/locking/lockdep.c:237 check_wait_context kernel/locking/lockdep.c:4855 [inline] WARNING: CPU: 1 PID: 7271 at kernel/locking/lockdep.c:237 __lock_acquire+0x338/0x3058 kernel/locking/lockdep.c:5185 Modules linked in: CPU: 1 UID: 0 PID: 7271 Comm: syz.0.137 Not tainted 6.15.0-rc4-syzkaller-ge0f4c8dd9d2d #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : hlock_class kernel/locking/lockdep.c:-1 [inline] pc : check_wait_context kernel/locking/lockdep.c:4855 [inline] pc : __lock_acquire+0x338/0x3058 kernel/locking/lockdep.c:5185 lr : hlock_class kernel/locking/lockdep.c:237 [inline] lr : check_wait_context kernel/locking/lockdep.c:4855 [inline] lr : __lock_acquire+0x32c/0x3058 kernel/locking/lockdep.c:5185 sp : ffff80009d2a72a0 x29: ffff80009d2a7380 x28: 0000000000000001 x27: ffff0000c4cce638 x26: ffff800080b8b8ac x25: 0000000000000000 x24: 0000000000000001 x23: 0000000000000000 x22: 0000000000000000 x21: ffff0000c4ccdb80 x20: ffff800096f4c000 x19: 0000000000000000 x18: 1fffe00036711a76 x17: 0000000000000000 x16: ffff80008ada5d6c x15: 0000000000000001 x14: 1fffe00036711ae2 x13: 0000000000000000 x12: 0000000000000000 x11: ffff800092d13bc0 x10: 000000000001cd8e x9 : 3252cac5a2b99700 x8 : 0000000000000000 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff80009d2a6bf8 x4 : ffff80008f3f4fa0 x3 : ffff8000807ab99c x2 : 0000000000000001 x1 : 0000000100000001 x0 : 0000000000000000 Call trace: hlock_class kernel/locking/lockdep.c:-1 [inline] (P) check_wait_context kernel/locking/lockdep.c:4855 [inline] (P) __lock_acquire+0x338/0x3058 kernel/locking/lockdep.c:5185 (P) lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5866 local_lock_acquire+0x3c/0x98 include/linux/local_lock_internal.h:38 ___slab_alloc+0xc3c/0xeb4 mm/slub.c:3921 __slab_alloc+0x74/0xd0 mm/slub.c:3962 __slab_alloc_node mm/slub.c:4037 [inline] slab_alloc_node mm/slub.c:4198 [inline] kmem_cache_alloc_noprof+0x2e0/0x3e8 mm/slub.c:4217 ext4_mb_add_groupinfo+0x5d8/0xcd0 fs/ext4/mballoc.c:3354 ext4_mb_init_backend fs/ext4/mballoc.c:3433 [inline] ext4_mb_init+0x10c4/0x1e64 fs/ext4/mballoc.c:3731 __ext4_fill_super fs/ext4/super.c:5556 [inline] ext4_fill_super+0x4274/0x4e88 fs/ext4/super.c:5726 get_tree_bdev_flags+0x360/0x414 fs/super.c:1636 get_tree_bdev+0x2c/0x3c fs/super.c:1659 ext4_get_tree+0x28/0x38 fs/ext4/super.c:5758 vfs_get_tree+0x90/0x28c fs/super.c:1759 do_new_mount+0x228/0x814 fs/namespace.c:3884 path_mount+0x5b4/0xde0 fs/namespace.c:4211 do_mount fs/namespace.c:4224 [inline] __do_sys_mount fs/namespace.c:4435 [inline] __se_sys_mount fs/namespace.c:4412 [inline] __arm64_sys_mount+0x3e8/0x468 fs/namespace.c:4412 __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+0x58/0x150 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 irq event stamp: 85424 hardirqs last enabled at (85423): [] seqcount_lockdep_reader_access+0x68/0xc8 include/linux/seqlock.h:74 hardirqs last disabled at (85424): [] ___slab_alloc+0xc18/0xeb4 mm/slub.c:3921 softirqs last enabled at (84438): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (84436): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]--- Unable to handle kernel NULL pointer dereference at virtual address 00000000000000c4 Mem abort info: ESR = 0x0000000096000006 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x06: level 2 translation fault Data abort info: ISV = 0, ISS = 0x00000006, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 user pgtable: 4k pages, 48-bit VAs, pgdp=000000010ae73000 [00000000000000c4] pgd=080000010f4a4403, p4d=080000010f4a4403, pud=080000011bca4403, pmd=0000000000000000 Internal error: Oops: 0000000096000006 [#1] SMP Modules linked in: CPU: 1 UID: 0 PID: 7271 Comm: syz.0.137 Tainted: G W 6.15.0-rc4-syzkaller-ge0f4c8dd9d2d #0 PREEMPT Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : check_wait_context kernel/locking/lockdep.c:4855 [inline] pc : __lock_acquire+0x34c/0x3058 kernel/locking/lockdep.c:5185 lr : hlock_class kernel/locking/lockdep.c:237 [inline] lr : check_wait_context kernel/locking/lockdep.c:4855 [inline] lr : __lock_acquire+0x32c/0x3058 kernel/locking/lockdep.c:5185 sp : ffff80009d2a72a0 x29: ffff80009d2a7380 x28: 0000000000000001 x27: ffff0000c4cce638 x26: ffff800080b8b8ac x25: 0000000000000000 x24: 0000000000000001 x23: 0000000000000000 x22: 0000000000000000 x21: ffff0000c4ccdb80 x20: ffff800096f4c000 x19: 0000000000000000 x18: 1fffe00036711a76 x17: 0000000000000000 x16: ffff80008ada5d6c x15: 0000000000000001 x14: 1fffe00036711ae2 x13: 0000000000000000 x12: 0000000000000000 x11: ffff800092d13bc0 x10: 000000000001cd8e x9 : 00000000000c1881 x8 : 0000000000000000 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff80009d2a6bf8 x4 : ffff80008f3f4fa0 x3 : ffff8000807ab99c x2 : 0000000000000001 x1 : 0000000100000001 x0 : 0000000000000000 Call trace: hlock_class kernel/locking/lockdep.c:228 [inline] (P) check_wait_context kernel/locking/lockdep.c:4856 [inline] (P) __lock_acquire+0x34c/0x3058 kernel/locking/lockdep.c:5185 (P) lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5866 local_lock_acquire+0x3c/0x98 include/linux/local_lock_internal.h:38 ___slab_alloc+0xc3c/0xeb4 mm/slub.c:3921 __slab_alloc+0x74/0xd0 mm/slub.c:3962 __slab_alloc_node mm/slub.c:4037 [inline] slab_alloc_node mm/slub.c:4198 [inline] kmem_cache_alloc_noprof+0x2e0/0x3e8 mm/slub.c:4217 ext4_mb_add_groupinfo+0x5d8/0xcd0 fs/ext4/mballoc.c:3354 ext4_mb_init_backend fs/ext4/mballoc.c:3433 [inline] ext4_mb_init+0x10c4/0x1e64 fs/ext4/mballoc.c:3731 __ext4_fill_super fs/ext4/super.c:5556 [inline] ext4_fill_super+0x4274/0x4e88 fs/ext4/super.c:5726 get_tree_bdev_flags+0x360/0x414 fs/super.c:1636 get_tree_bdev+0x2c/0x3c fs/super.c:1659 ext4_get_tree+0x28/0x38 fs/ext4/super.c:5758 vfs_get_tree+0x90/0x28c fs/super.c:1759 do_new_mount+0x228/0x814 fs/namespace.c:3884 path_mount+0x5b4/0xde0 fs/namespace.c:4211 do_mount fs/namespace.c:4224 [inline] __do_sys_mount fs/namespace.c:4435 [inline] __se_sys_mount fs/namespace.c:4412 [inline] __arm64_sys_mount+0x3e8/0x468 fs/namespace.c:4412 __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+0x58/0x150 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Code: 14000003 d0093feb 912f016b b9402369 (39431113) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 14000003 b 0xc 4: d0093feb adrp x11, 0x127fe000 8: 912f016b add x11, x11, #0xbc0 c: b9402369 ldr w9, [x27, #32] * 10: 39431113 ldrb w19, [x8, #196] <-- trapping instruction