Hello, syzbot found the following issue on: HEAD commit: 91091656252f s390/bpf: Perform r1 range checking before ac.. git tree: bpf console output: https://syzkaller.appspot.com/x/log.txt?x=14954378300000 kernel config: https://syzkaller.appspot.com/x/.config?x=51ea6c9df4ed04c4 dashboard link: https://syzkaller.appspot.com/bug?extid=12a265012f9ce626f9de IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+12a265012f9ce626f9de@xxxxxxxxxxxxxxxxxxxxxxxxx ====================================================== WARNING: possible circular locking dependency detected 5.13.0-syzkaller #0 Not tainted ------------------------------------------------------ syz-fuzzer/8445 is trying to acquire lock: ffffffff8ba9c180 (fs_reclaim){+.+.}-{0:0}, at: fs_reclaim_acquire+0xf7/0x160 mm/page_alloc.c:4586 but task is already holding lock: ffff8880b9c4d620 (lock#2){-.-.}-{2:2}, at: __alloc_pages_bulk+0x4ad/0x1870 mm/page_alloc.c:5291 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (lock#2){-.-.}-{2:2}: local_lock_acquire include/linux/local_lock_internal.h:42 [inline] rmqueue_pcplist mm/page_alloc.c:3675 [inline] rmqueue mm/page_alloc.c:3713 [inline] get_page_from_freelist+0x4aa/0x2f80 mm/page_alloc.c:4175 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5386 alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2272 stack_depot_save+0x39d/0x4e0 lib/stackdepot.c:303 kasan_save_stack+0x32/0x40 mm/kasan/common.c:40 kasan_record_aux_stack+0xe5/0x110 mm/kasan/generic.c:348 insert_work+0x48/0x370 kernel/workqueue.c:1332 __queue_work+0x5c1/0xed0 kernel/workqueue.c:1498 queue_work_on+0xee/0x110 kernel/workqueue.c:1525 rcu_do_batch kernel/rcu/tree.c:2558 [inline] rcu_core+0x7ab/0x1380 kernel/rcu/tree.c:2793 __do_softirq+0x29b/0x9bd kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x16e/0x1c0 kernel/softirq.c:636 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 rol32 include/linux/bitops.h:108 [inline] jhash2 include/linux/jhash.h:129 [inline] hash_stack lib/stackdepot.c:181 [inline] stack_depot_save+0xe8/0x4e0 lib/stackdepot.c:273 kasan_save_stack+0x32/0x40 mm/kasan/common.c:40 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free mm/kasan/common.c:328 [inline] __kasan_slab_free+0xfb/0x130 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:229 [inline] slab_free_hook mm/slub.c:1639 [inline] slab_free_freelist_hook+0xdf/0x240 mm/slub.c:1664 slab_free mm/slub.c:3224 [inline] kmem_cache_free+0x8e/0x5a0 mm/slub.c:3240 add_system_zone+0x48e/0x690 fs/ext4/block_validity.c:108 ext4_setup_system_zone+0x230/0xab0 fs/ext4/block_validity.c:244 ext4_fill_super+0x7ccc/0xe440 fs/ext4/super.c:4990 mount_bdev+0x34d/0x410 fs/super.c:1368 legacy_get_tree+0x105/0x220 fs/fs_context.c:592 vfs_get_tree+0x89/0x2f0 fs/super.c:1498 do_new_mount fs/namespace.c:2905 [inline] path_mount+0x132a/0x1fa0 fs/namespace.c:3235 init_mount+0xaa/0xf4 fs/init.c:25 do_mount_root+0x9c/0x25b init/do_mounts.c:386 mount_block_root+0x32e/0x4dd init/do_mounts.c:417 mount_root+0x1af/0x1f5 init/do_mounts.c:555 prepare_namespace+0x1ff/0x234 init/do_mounts.c:607 kernel_init_freeable+0x729/0x741 init/main.c:1570 kernel_init+0x1a/0x1d0 init/main.c:1449 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 -> #1 (&pool->lock){-.-.}-{2:2}: __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151 __queue_work+0x366/0xed0 kernel/workqueue.c:1455 queue_work_on+0xee/0x110 kernel/workqueue.c:1525 queue_work include/linux/workqueue.h:507 [inline] schedule_work include/linux/workqueue.h:568 [inline] __vfree_deferred mm/vmalloc.c:2591 [inline] vfree_atomic+0xac/0xe0 mm/vmalloc.c:2609 free_thread_stack kernel/fork.c:292 [inline] release_task_stack kernel/fork.c:432 [inline] put_task_stack+0x2e0/0x4e0 kernel/fork.c:443 finish_task_switch.isra.0+0x77f/0xa50 kernel/sched/core.c:4595 context_switch kernel/sched/core.c:4686 [inline] __schedule+0x93c/0x2710 kernel/sched/core.c:5940 preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:6328 irqentry_exit+0x31/0x80 kernel/entry/common.c:427 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 lock_acquire+0x1ef/0x510 kernel/locking/lockdep.c:5593 __fs_reclaim_acquire mm/page_alloc.c:4564 [inline] fs_reclaim_acquire+0x117/0x160 mm/page_alloc.c:4578 might_alloc include/linux/sched/mm.h:198 [inline] slab_pre_alloc_hook mm/slab.h:485 [inline] slab_alloc_node mm/slub.c:2891 [inline] slab_alloc mm/slub.c:2978 [inline] kmem_cache_alloc+0x3e/0x4a0 mm/slub.c:2983 prepare_creds+0x3f/0x7b0 kernel/cred.c:262 copy_creds+0x9f/0xb20 kernel/cred.c:367 copy_process+0x1413/0x74c0 kernel/fork.c:1992 kernel_clone+0xe7/0xab0 kernel/fork.c:2509 kernel_thread+0xb5/0xf0 kernel/fork.c:2561 call_usermodehelper_exec_work kernel/umh.c:174 [inline] call_usermodehelper_exec_work+0xcc/0x180 kernel/umh.c:160 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 -> #0 (fs_reclaim){+.+.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3051 [inline] check_prevs_add kernel/locking/lockdep.c:3174 [inline] validate_chain kernel/locking/lockdep.c:3789 [inline] __lock_acquire+0x2a07/0x54a0 kernel/locking/lockdep.c:5015 lock_acquire kernel/locking/lockdep.c:5625 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5590 __fs_reclaim_acquire mm/page_alloc.c:4564 [inline] fs_reclaim_acquire+0x117/0x160 mm/page_alloc.c:4578 prepare_alloc_pages+0x15c/0x580 mm/page_alloc.c:5176 __alloc_pages+0x12f/0x500 mm/page_alloc.c:5375 alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2272 stack_depot_save+0x39d/0x4e0 lib/stackdepot.c:303 save_stack+0x15e/0x1e0 mm/page_owner.c:120 __set_page_owner+0x50/0x290 mm/page_owner.c:181 prep_new_page mm/page_alloc.c:2445 [inline] __alloc_pages_bulk+0x8b9/0x1870 mm/page_alloc.c:5313 alloc_pages_bulk_array_node include/linux/gfp.h:557 [inline] vm_area_alloc_pages mm/vmalloc.c:2775 [inline] __vmalloc_area_node mm/vmalloc.c:2845 [inline] __vmalloc_node_range+0x39d/0x960 mm/vmalloc.c:2947 __vmalloc_node mm/vmalloc.c:2996 [inline] __vmalloc+0x69/0x80 mm/vmalloc.c:3010 snd_dma_alloc_pages+0x433/0x590 sound/core/memalloc.c:150 do_alloc_pages+0x9b/0x160 sound/core/pcm_memory.c:43 snd_pcm_lib_malloc_pages+0x3f6/0x880 sound/core/pcm_memory.c:404 snd_pcm_hw_params+0x1408/0x1990 sound/core/pcm_native.c:705 snd_pcm_kernel_ioctl+0xd1/0x240 sound/core/pcm_native.c:3332 snd_pcm_oss_change_params_locked+0x1958/0x3990 sound/core/oss/pcm_oss.c:947 snd_pcm_oss_change_params sound/core/oss/pcm_oss.c:1090 [inline] snd_pcm_oss_make_ready+0xe7/0x1b0 sound/core/oss/pcm_oss.c:1149 snd_pcm_oss_sync+0x1de/0x800 sound/core/oss/pcm_oss.c:1714 snd_pcm_oss_release+0x276/0x300 sound/core/oss/pcm_oss.c:2556 __fput+0x288/0x920 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae other info that might help us debug this: Chain exists of: fs_reclaim --> &pool->lock --> lock#2 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(lock#2); lock(&pool->lock); lock(lock#2); lock(fs_reclaim); *** DEADLOCK *** 2 locks held by syz-fuzzer/8445: #0: ffff88802e47e440 (&runtime->oss.params_lock){+.+.}-{3:3}, at: snd_pcm_oss_change_params sound/core/oss/pcm_oss.c:1087 [inline] #0: ffff88802e47e440 (&runtime->oss.params_lock){+.+.}-{3:3}, at: snd_pcm_oss_make_ready+0xc7/0x1b0 sound/core/oss/pcm_oss.c:1149 #1: ffff8880b9c4d620 (lock#2){-.-.}-{2:2}, at: __alloc_pages_bulk+0x4ad/0x1870 mm/page_alloc.c:5291 stack backtrace: CPU: 0 PID: 8445 Comm: syz-fuzzer Not tainted 5.13.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:96 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2131 check_prev_add kernel/locking/lockdep.c:3051 [inline] check_prevs_add kernel/locking/lockdep.c:3174 [inline] validate_chain kernel/locking/lockdep.c:3789 [inline] __lock_acquire+0x2a07/0x54a0 kernel/locking/lockdep.c:5015 lock_acquire kernel/locking/lockdep.c:5625 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5590 __fs_reclaim_acquire mm/page_alloc.c:4564 [inline] fs_reclaim_acquire+0x117/0x160 mm/page_alloc.c:4578 prepare_alloc_pages+0x15c/0x580 mm/page_alloc.c:5176 __alloc_pages+0x12f/0x500 mm/page_alloc.c:5375 alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2272 stack_depot_save+0x39d/0x4e0 lib/stackdepot.c:303 save_stack+0x15e/0x1e0 mm/page_owner.c:120 __set_page_owner+0x50/0x290 mm/page_owner.c:181 prep_new_page mm/page_alloc.c:2445 [inline] __alloc_pages_bulk+0x8b9/0x1870 mm/page_alloc.c:5313 alloc_pages_bulk_array_node include/linux/gfp.h:557 [inline] vm_area_alloc_pages mm/vmalloc.c:2775 [inline] __vmalloc_area_node mm/vmalloc.c:2845 [inline] __vmalloc_node_range+0x39d/0x960 mm/vmalloc.c:2947 __vmalloc_node mm/vmalloc.c:2996 [inline] __vmalloc+0x69/0x80 mm/vmalloc.c:3010 snd_dma_alloc_pages+0x433/0x590 sound/core/memalloc.c:150 do_alloc_pages+0x9b/0x160 sound/core/pcm_memory.c:43 snd_pcm_lib_malloc_pages+0x3f6/0x880 sound/core/pcm_memory.c:404 snd_pcm_hw_params+0x1408/0x1990 sound/core/pcm_native.c:705 snd_pcm_kernel_ioctl+0xd1/0x240 sound/core/pcm_native.c:3332 snd_pcm_oss_change_params_locked+0x1958/0x3990 sound/core/oss/pcm_oss.c:947 snd_pcm_oss_change_params sound/core/oss/pcm_oss.c:1090 [inline] snd_pcm_oss_make_ready+0xe7/0x1b0 sound/core/oss/pcm_oss.c:1149 snd_pcm_oss_sync+0x1de/0x800 sound/core/oss/pcm_oss.c:1714 snd_pcm_oss_release+0x276/0x300 sound/core/oss/pcm_oss.c:2556 __fput+0x288/0x920 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4af19b Code: fb ff eb bd e8 a6 b6 fb ff e9 61 ff ff ff cc e8 9b 82 fb ff 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30 RSP: 002b:000000c00037d430 EFLAGS: 00000206 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 000000c00001c000 RCX: 00000000004af19b RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000006 RBP: 000000c00037d470 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 000000000000013f R13: 000000000000013e R14: 0000000000000200 R15: 000000c000293400 BUG: sleeping function called from invalid context at mm/page_alloc.c:5179 in_atomic(): 0, irqs_disabled(): 1, non_block: 0, pid: 8445, name: syz-fuzzer INFO: lockdep is turned off. irq event stamp: 114834 hardirqs last enabled at (114833): [<ffffffff89228250>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (114833): [<ffffffff89228250>] _raw_spin_unlock_irqrestore+0x50/0x70 kernel/locking/spinlock.c:191 hardirqs last disabled at (114834): [<ffffffff81b21dc7>] __alloc_pages_bulk+0x1017/0x1870 mm/page_alloc.c:5291 softirqs last enabled at (114470): [<ffffffff8146347e>] invoke_softirq kernel/softirq.c:432 [inline] softirqs last enabled at (114470): [<ffffffff8146347e>] __irq_exit_rcu+0x16e/0x1c0 kernel/softirq.c:636 softirqs last disabled at (114449): [<ffffffff8146347e>] invoke_softirq kernel/softirq.c:432 [inline] softirqs last disabled at (114449): [<ffffffff8146347e>] __irq_exit_rcu+0x16e/0x1c0 kernel/softirq.c:636 CPU: 0 PID: 8445 Comm: syz-fuzzer Not tainted 5.13.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:96 ___might_sleep.cold+0x1f1/0x237 kernel/sched/core.c:9153 prepare_alloc_pages+0x3da/0x580 mm/page_alloc.c:5179 __alloc_pages+0x12f/0x500 mm/page_alloc.c:5375 alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2272 stack_depot_save+0x39d/0x4e0 lib/stackdepot.c:303 save_stack+0x15e/0x1e0 mm/page_owner.c:120 __set_page_owner+0x50/0x290 mm/page_owner.c:181 prep_new_page mm/page_alloc.c:2445 [inline] __alloc_pages_bulk+0x8b9/0x1870 mm/page_alloc.c:5313 alloc_pages_bulk_array_node include/linux/gfp.h:557 [inline] vm_area_alloc_pages mm/vmalloc.c:2775 [inline] __vmalloc_area_node mm/vmalloc.c:2845 [inline] __vmalloc_node_range+0x39d/0x960 mm/vmalloc.c:2947 __vmalloc_node mm/vmalloc.c:2996 [inline] __vmalloc+0x69/0x80 mm/vmalloc.c:3010 snd_dma_alloc_pages+0x433/0x590 sound/core/memalloc.c:150 do_alloc_pages+0x9b/0x160 sound/core/pcm_memory.c:43 snd_pcm_lib_malloc_pages+0x3f6/0x880 sound/core/pcm_memory.c:404 snd_pcm_hw_params+0x1408/0x1990 sound/core/pcm_native.c:705 snd_pcm_kernel_ioctl+0xd1/0x240 sound/core/pcm_native.c:3332 snd_pcm_oss_change_params_locked+0x1958/0x3990 sound/core/oss/pcm_oss.c:947 snd_pcm_oss_change_params sound/core/oss/pcm_oss.c:1090 [inline] snd_pcm_oss_make_ready+0xe7/0x1b0 sound/core/oss/pcm_oss.c:1149 snd_pcm_oss_sync+0x1de/0x800 sound/core/oss/pcm_oss.c:1714 snd_pcm_oss_release+0x276/0x300 sound/core/oss/pcm_oss.c:2556 __fput+0x288/0x920 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4af19b Code: fb ff eb bd e8 a6 b6 fb ff e9 61 ff ff ff cc e8 9b 82 fb ff 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30 RSP: 002b:000000c00037d430 EFLAGS: 00000206 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 000000c00001c000 RCX: 00000000004af19b RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000006 RBP: 000000c00037d470 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 000000000000013f R13: 000000000000013e R14: 0000000000000200 R15: 000000c000293400 can: request_module (can-proto-0) failed. can: request_module (can-proto-0) failed. can: request_module (can-proto-0) failed. base_sock_release(ffff88803967c540) sk=ffff888020e7c000 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
