loop0: detected capacity change from 0 to 1024 hfsplus: bad catalog folder entry ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.0.0/5315 is trying to acquire lock: ffffffff8e227128 (pcpu_alloc_mutex){+.+.}-{4:4}, at: pcpu_alloc_noprof+0x286/0x1720 mm/percpu.c:1782 but task is already holding lock: ffff8880330f9e18 (&q->q_usage_counter(io)#17){++++}-{0:0}, at: blk_mq_freeze_queue include/linux/blk-mq.h:938 [inline] ffff8880330f9e18 (&q->q_usage_counter(io)#17){++++}-{0:0}, at: blk_throtl_init+0x266/0x510 block/blk-throttle.c:1330 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&q->q_usage_counter(io)#17){++++}-{0:0}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 blk_alloc_queue+0x538/0x620 block/blk-core.c:461 blk_mq_alloc_queue block/blk-mq.c:4399 [inline] __blk_mq_alloc_disk+0x15c/0x340 block/blk-mq.c:4446 loop_add+0x411/0xad0 drivers/block/loop.c:2047 loop_init+0xd9/0x170 drivers/block/loop.c:2282 do_one_initcall+0x236/0x820 init/main.c:1283 do_initcall_level+0x104/0x190 init/main.c:1345 do_initcalls+0x59/0xa0 init/main.c:1361 kernel_init_freeable+0x334/0x4b0 init/main.c:1593 kernel_init+0x1d/0x1d0 init/main.c:1483 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #1 (fs_reclaim){+.+.}-{0:0}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 __fs_reclaim_acquire mm/page_alloc.c:4269 [inline] fs_reclaim_acquire+0x72/0x100 mm/page_alloc.c:4283 might_alloc include/linux/sched/mm.h:318 [inline] prepare_alloc_pages+0x153/0x610 mm/page_alloc.c:4951 __alloc_frozen_pages_noprof+0x123/0x370 mm/page_alloc.c:5172 __alloc_pages_noprof+0xa/0x30 mm/page_alloc.c:5217 __alloc_pages_node_noprof include/linux/gfp.h:284 [inline] alloc_pages_node_noprof include/linux/gfp.h:311 [inline] pcpu_alloc_pages mm/percpu-vm.c:95 [inline] pcpu_populate_chunk+0x182/0xb30 mm/percpu-vm.c:285 pcpu_alloc_noprof+0xcbf/0x1720 mm/percpu.c:1870 iommu_dma_init_fq_percpu drivers/iommu/dma-iommu.c:320 [inline] iommu_dma_init_fq+0x279/0x610 drivers/iommu/dma-iommu.c:346 iommu_dma_init_domain drivers/iommu/dma-iommu.c:709 [inline] iommu_setup_dma_ops+0x6cc/0x1820 drivers/iommu/dma-iommu.c:2107 bus_iommu_probe+0x251/0x400 drivers/iommu/iommu.c:1937 iommu_device_register+0x1af/0x210 drivers/iommu/iommu.c:277 intel_iommu_init+0x6e7/0x8d0 drivers/iommu/intel/iommu.c:3136 pci_iommu_init+0x38/0x70 arch/x86/kernel/pci-dma.c:174 do_one_initcall+0x236/0x820 init/main.c:1283 do_initcall_level+0x104/0x190 init/main.c:1345 do_initcalls+0x59/0xa0 init/main.c:1361 kernel_init_freeable+0x334/0x4b0 init/main.c:1593 kernel_init+0x1d/0x1d0 init/main.c:1483 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #0 (pcpu_alloc_mutex){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3908 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 __mutex_lock_common kernel/locking/mutex.c:598 [inline] __mutex_lock+0x187/0x1350 kernel/locking/mutex.c:760 pcpu_alloc_noprof+0x286/0x1720 mm/percpu.c:1782 __percpu_counter_init_many+0x43/0x380 lib/percpu_counter.c:198 blkg_rwstat_init+0x2c/0x170 block/blk-cgroup-rwstat.c:12 throtl_pd_alloc+0xb6/0x460 block/blk-throttle.c:278 blkcg_activate_policy+0x693/0xb50 block/blk-cgroup.c:1637 blk_throtl_init+0x2e0/0x510 block/blk-throttle.c:1337 tg_set_conf+0x1c6/0x4b0 block/blk-throttle.c:1376 cgroup_file_write+0x39e/0x740 kernel/cgroup/cgroup.c:4312 kernfs_fop_write_iter+0x3af/0x540 fs/kernfs/file.c:352 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x5c9/0xb30 fs/read_write.c:686 ksys_write+0x145/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: pcpu_alloc_mutex --> fs_reclaim --> &q->q_usage_counter(io)#17 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&q->q_usage_counter(io)#17); lock(fs_reclaim); lock(&q->q_usage_counter(io)#17); lock(pcpu_alloc_mutex); *** DEADLOCK *** 7 locks held by syz.0.0/5315: #0: ffff888012259d38 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x247/0x320 fs/file.c:1232 #1: ffff888012226420 (sb_writers#10){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3111 [inline] #1: ffff888012226420 (sb_writers#10){.+.+}-{0:0}, at: vfs_write+0x211/0xb30 fs/read_write.c:682 #2: ffff88801a082888 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1de/0x540 fs/kernfs/file.c:343 #3: ffff88803f8020f8 (kn->active#65){.+.+}-{0:0}, at: kernfs_get_active_of fs/kernfs/file.c:80 [inline] #3: ffff88803f8020f8 (kn->active#65){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x231/0x540 fs/kernfs/file.c:344 #4: ffff8880330fa020 (&q->rq_qos_mutex){+.+.}-{4:4}, at: blkg_conf_open_bdev+0x2a2/0x3d0 block/blk-cgroup.c:802 #5: ffff8880330f9e18 (&q->q_usage_counter(io)#17){++++}-{0:0}, at: blk_mq_freeze_queue include/linux/blk-mq.h:938 [inline] #5: ffff8880330f9e18 (&q->q_usage_counter(io)#17){++++}-{0:0}, at: blk_throtl_init+0x266/0x510 block/blk-throttle.c:1330 #6: ffff8880330f9e50 (&q->q_usage_counter(queue)){+.+.}-{0:0}, at: blk_mq_freeze_queue include/linux/blk-mq.h:938 [inline] #6: ffff8880330f9e50 (&q->q_usage_counter(queue)){+.+.}-{0:0}, at: blk_throtl_init+0x266/0x510 block/blk-throttle.c:1330 stack backtrace: CPU: 0 UID: 0 PID: 5315 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 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_lvl+0x189/0x250 lib/dump_stack.c:120 print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2043 check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2175 check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3908 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 __mutex_lock_common kernel/locking/mutex.c:598 [inline] __mutex_lock+0x187/0x1350 kernel/locking/mutex.c:760 pcpu_alloc_noprof+0x286/0x1720 mm/percpu.c:1782 __percpu_counter_init_many+0x43/0x380 lib/percpu_counter.c:198 blkg_rwstat_init+0x2c/0x170 block/blk-cgroup-rwstat.c:12 throtl_pd_alloc+0xb6/0x460 block/blk-throttle.c:278 blkcg_activate_policy+0x693/0xb50 block/blk-cgroup.c:1637 blk_throtl_init+0x2e0/0x510 block/blk-throttle.c:1337 tg_set_conf+0x1c6/0x4b0 block/blk-throttle.c:1376 cgroup_file_write+0x39e/0x740 kernel/cgroup/cgroup.c:4312 kernfs_fop_write_iter+0x3af/0x540 fs/kernfs/file.c:352 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x5c9/0xb30 fs/read_write.c:686 ksys_write+0x145/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f0f7b18eec9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f0f7bf90038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f0f7b3e5fa0 RCX: 00007f0f7b18eec9 RDX: 000000000000006a RSI: 00002000000000c0 RDI: 0000000000000005 RBP: 00007f0f7bf90090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007f0f7b3e6038 R14: 00007f0f7b3e5fa0 R15: 00007ffc94b88e58