====================================================== WARNING: possible circular locking dependency detected 6.12.0-syzkaller-01892-g8f7c8b88bda4 #0 Not tainted ------------------------------------------------------ syz.7.496/8591 is trying to acquire lock: ffff8880321b9f20 (&mm->mmap_lock){++++}-{4:4}, at: __might_fault mm/memory.c:6716 [inline] ffff8880321b9f20 (&mm->mmap_lock){++++}-{4:4}, at: __might_fault+0xe3/0x190 mm/memory.c:6709 but task is already holding lock: ffff88802565fe78 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0x33/0x70 kernel/trace/blktrace.c:647 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #5 (&q->debugfs_mutex){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x19b/0xa60 kernel/locking/mutex.c:735 blk_mq_init_sched+0x42b/0x640 block/blk-mq-sched.c:473 elevator_init_mq+0x2cd/0x420 block/elevator.c:610 add_disk_fwnode+0x113/0x1300 block/genhd.c:413 sd_probe+0xa86/0x1000 drivers/scsi/sd.c:4024 call_driver_probe drivers/base/dd.c:579 [inline] really_probe+0x23e/0xa90 drivers/base/dd.c:658 __driver_probe_device+0x1de/0x440 drivers/base/dd.c:800 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:830 __device_attach_driver+0x1df/0x310 drivers/base/dd.c:958 bus_for_each_drv+0x157/0x1e0 drivers/base/bus.c:459 __device_attach_async_helper+0x1d3/0x290 drivers/base/dd.c:987 async_run_entry_fn+0x9c/0x530 kernel/async.c:129 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 -> #4 (&q->q_usage_counter(queue)#51){++++}-{0:0}: blk_queue_enter+0x50f/0x640 block/blk-core.c:328 blk_mq_alloc_request+0x59b/0x950 block/blk-mq.c:652 scsi_alloc_request drivers/scsi/scsi_lib.c:1222 [inline] scsi_execute_cmd+0x1eb/0xf40 drivers/scsi/scsi_lib.c:304 read_capacity_16+0x213/0xe10 drivers/scsi/sd.c:2655 sd_read_capacity drivers/scsi/sd.c:2824 [inline] sd_revalidate_disk.isra.0+0x1a06/0xa8d0 drivers/scsi/sd.c:3734 sd_probe+0x904/0x1000 drivers/scsi/sd.c:4010 call_driver_probe drivers/base/dd.c:579 [inline] really_probe+0x23e/0xa90 drivers/base/dd.c:658 __driver_probe_device+0x1de/0x440 drivers/base/dd.c:800 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:830 __device_attach_driver+0x1df/0x310 drivers/base/dd.c:958 bus_for_each_drv+0x157/0x1e0 drivers/base/bus.c:459 __device_attach_async_helper+0x1d3/0x290 drivers/base/dd.c:987 async_run_entry_fn+0x9c/0x530 kernel/async.c:129 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 -> #3 (&q->limits_lock){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x19b/0xa60 kernel/locking/mutex.c:735 queue_limits_start_update include/linux/blkdev.h:945 [inline] __nbd_set_size+0x2c0/0x730 drivers/block/nbd.c:351 nbd_set_size drivers/block/nbd.c:388 [inline] nbd_start_device+0x8fd/0xd70 drivers/block/nbd.c:1456 nbd_start_device_ioctl drivers/block/nbd.c:1464 [inline] __nbd_ioctl drivers/block/nbd.c:1539 [inline] nbd_ioctl+0x21a/0xfd0 drivers/block/nbd.c:1579 blkdev_ioctl+0x276/0x6d0 block/ioctl.c:693 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #2 (&q->q_usage_counter(io)#57){++++}-{0:0}: bio_queue_enter block/blk.h:75 [inline] blk_mq_submit_bio+0x1fc4/0x24c0 block/blk-mq.c:3092 __submit_bio+0x384/0x540 block/blk-core.c:629 __submit_bio_noacct_mq block/blk-core.c:710 [inline] submit_bio_noacct_nocheck+0x6fb/0xd70 block/blk-core.c:739 submit_bio_noacct+0x93a/0x1e10 block/blk-core.c:868 submit_bh fs/buffer.c:2825 [inline] block_read_full_folio+0x812/0xa50 fs/buffer.c:2452 filemap_read_folio+0xc6/0x2a0 mm/filemap.c:2367 filemap_update_page mm/filemap.c:2451 [inline] filemap_get_pages+0x1560/0x1be0 mm/filemap.c:2572 filemap_read+0x3ca/0xd70 mm/filemap.c:2647 blkdev_read_iter+0x187/0x480 block/fops.c:767 new_sync_read fs/read_write.c:484 [inline] vfs_read+0x87f/0xbe0 fs/read_write.c:565 ksys_read+0x12b/0x250 fs/read_write.c:708 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (mapping.invalidate_lock#2){++++}-{4:4}: down_read+0x9a/0x330 kernel/locking/rwsem.c:1524 filemap_invalidate_lock_shared include/linux/fs.h:873 [inline] filemap_fault+0x62e/0x2820 mm/filemap.c:3352 __do_fault+0x10a/0x490 mm/memory.c:4882 do_read_fault mm/memory.c:5297 [inline] do_fault mm/memory.c:5431 [inline] do_pte_missing+0xec5/0x3e70 mm/memory.c:3965 handle_pte_fault mm/memory.c:5766 [inline] __handle_mm_fault+0x100a/0x2a10 mm/memory.c:5909 handle_mm_fault+0x3fa/0xaa0 mm/memory.c:6077 faultin_page mm/gup.c:1187 [inline] __get_user_pages+0x8d9/0x3b50 mm/gup.c:1485 populate_vma_page_range+0x27f/0x3a0 mm/gup.c:1923 __mm_populate+0x1d6/0x380 mm/gup.c:2026 do_mlock+0x40a/0x7d0 mm/mlock.c:653 __do_sys_mlock mm/mlock.c:661 [inline] __se_sys_mlock mm/mlock.c:659 [inline] __x64_sys_mlock+0x59/0x80 mm/mlock.c:659 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&mm->mmap_lock){++++}-{4:4}: check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain kernel/locking/lockdep.c:3904 [inline] __lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5226 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849 __might_fault mm/memory.c:6716 [inline] __might_fault+0x11b/0x190 mm/memory.c:6709 _inline_copy_from_user include/linux/uaccess.h:162 [inline] _copy_from_user+0x29/0xd0 lib/usercopy.c:18 copy_from_user include/linux/uaccess.h:212 [inline] __blk_trace_setup+0xa8/0x180 kernel/trace/blktrace.c:626 blk_trace_setup+0x47/0x70 kernel/trace/blktrace.c:648 sg_ioctl_common drivers/scsi/sg.c:1121 [inline] sg_ioctl+0x65e/0x2750 drivers/scsi/sg.c:1163 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: &mm->mmap_lock --> &q->q_usage_counter(queue)#51 --> &q->debugfs_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&q->debugfs_mutex); lock(&q->q_usage_counter(queue)#51); lock(&q->debugfs_mutex); rlock(&mm->mmap_lock); *** DEADLOCK *** 1 lock held by syz.7.496/8591: #0: ffff88802565fe78 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0x33/0x70 kernel/trace/blktrace.c:647 stack backtrace: CPU: 1 UID: 0 PID: 8591 Comm: syz.7.496 Not tainted 6.12.0-syzkaller-01892-g8f7c8b88bda4 #0 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 lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_circular_bug+0x419/0x5d0 kernel/locking/lockdep.c:2074 check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2206 check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain kernel/locking/lockdep.c:3904 [inline] __lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5226 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849 __might_fault mm/memory.c:6716 [inline] __might_fault+0x11b/0x190 mm/memory.c:6709 _inline_copy_from_user include/linux/uaccess.h:162 [inline] _copy_from_user+0x29/0xd0 lib/usercopy.c:18 copy_from_user include/linux/uaccess.h:212 [inline] __blk_trace_setup+0xa8/0x180 kernel/trace/blktrace.c:626 blk_trace_setup+0x47/0x70 kernel/trace/blktrace.c:648 sg_ioctl_common drivers/scsi/sg.c:1121 [inline] sg_ioctl+0x65e/0x2750 drivers/scsi/sg.c:1163 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6d6277e819 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:00007f6d635ae038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f6d62935fa0 RCX: 00007f6d6277e819 RDX: 0000000020000540 RSI: 00000000c0481273 RDI: 0000000000000003 RBP: 00007f6d627f175e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f6d62935fa0 R15: 00007fff91121f08 syz.7.496: page allocation failure: order:0, mode:0xcc0(GFP_KERNEL), nodemask=(null),cpuset=/,mems_allowed=0-1 CPU: 1 UID: 0 PID: 8591 Comm: syz.7.496 Not tainted 6.12.0-syzkaller-01892-g8f7c8b88bda4 #0 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 lib/dump_stack.c:94 [inline] dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120 warn_alloc+0x24d/0x3a0 mm/page_alloc.c:3548 __alloc_pages_slowpath mm/page_alloc.c:4482 [inline] __alloc_pages_noprof+0x159c/0x25a0 mm/page_alloc.c:4764 alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2265 get_free_pages_noprof+0xc/0x40 mm/page_alloc.c:4798 kasan_populate_vmalloc_pte+0x2d/0x160 mm/kasan/shadow.c:304 apply_to_pte_range mm/memory.c:2817 [inline] apply_to_pmd_range mm/memory.c:2861 [inline] apply_to_pud_range mm/memory.c:2897 [inline] apply_to_p4d_range mm/memory.c:2933 [inline] __apply_to_page_range+0x5fd/0xd30 mm/memory.c:2967 alloc_vmap_area+0x93e/0x2a70 mm/vmalloc.c:2035 __get_vm_area_node+0x17e/0x2d0 mm/vmalloc.c:3116 get_vm_area_caller mm/vmalloc.c:3167 [inline] vmap+0x15a/0x350 mm/vmalloc.c:3436 relay_alloc_buf kernel/relay.c:126 [inline] relay_create_buf kernel/relay.c:162 [inline] relay_open_buf.part.0+0x446/0xb90 kernel/relay.c:384 relay_open_buf kernel/relay.c:536 [inline] relay_open+0x653/0xad0 kernel/relay.c:517 do_blk_trace_setup+0x4fd/0xb40 kernel/trace/blktrace.c:590 __blk_trace_setup+0xd8/0x180 kernel/trace/blktrace.c:630 blk_trace_setup+0x47/0x70 kernel/trace/blktrace.c:648 sg_ioctl_common drivers/scsi/sg.c:1121 [inline] sg_ioctl+0x65e/0x2750 drivers/scsi/sg.c:1163 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6d6277e819 Code: Unable to access opcode bytes at 0x7f6d6277e7ef. RSP: 002b:00007f6d635ae038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f6d62935fa0 RCX: 00007f6d6277e819 RDX: 0000000020000540 RSI: 00000000c0481273 RDI: 0000000000000003 RBP: 00007f6d627f175e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f6d62935fa0 R15: 00007fff91121f08 Mem-Info: active_anon:17 inactive_anon:0 isolated_anon:0 active_file:3 inactive_file:146 isolated_file:0 unevictable:1768 dirty:116 writeback:0 slab_reclaimable:10400 slab_unreclaimable:81854 mapped:5164 shmem:1767 pagetables:377 sec_pagetables:323 bounce:0 kernel_misc_reclaimable:0 free:5890 free_pcp:5483 free_cma:0 Node 0 active_anon:0kB inactive_anon:0kB active_file:192kB inactive_file:304kB unevictable:3536kB isolated(anon):0kB isolated(file):0kB mapped:20556kB dirty:464kB writeback:0kB shmem:3536kB shmem_thp:0kB shmem_pmdmapped:0kB anon_thp:0kB writeback_tmp:0kB kernel_stack:12304kB pagetables:1468kB sec_pagetables:1280kB all_unreclaimable? yes Node 1 active_anon:68kB inactive_anon:0kB active_file:100kB inactive_file:0kB unevictable:3536kB isolated(anon):0kB isolated(file):0kB mapped:100kB dirty:0kB writeback:0kB shmem:3532kB shmem_thp:0kB shmem_pmdmapped:0kB anon_thp:0kB writeback_tmp:0kB kernel_stack:80kB pagetables:40kB sec_pagetables:12kB all_unreclaimable? yes Node 0 DMA free:120kB boost:0kB min:340kB low:424kB high:508kB reserved_highatomic:0KB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15992kB managed:15360kB mlocked:0kB bounce:0kB free_pcp:100kB local_pcp:0kB free_cma:0kB lowmem_reserve[]: 0 1212 0 0 0 Node 0 DMA32 free:10928kB boost:14336kB min:41944kB low:48844kB high:55744kB reserved_highatomic:0KB active_anon:0kB inactive_anon:0kB active_file:148kB inactive_file:348kB unevictable:3536kB writepending:464kB present:2080628kB managed:1269888kB mlocked:0kB bounce:0kB free_pcp:9472kB local_pcp:64kB free_cma:0kB lowmem_reserve[]: 0 0 0 0 0 Node 1 Normal free:13068kB boost:0kB min:39632kB low:49540kB high:59448kB reserved_highatomic:0KB active_anon:68kB inactive_anon:0kB active_file:100kB inactive_file:0kB unevictable:3536kB writepending:0kB present:2097152kB managed:1781924kB mlocked:0kB bounce:0kB free_pcp:12336kB local_pcp:8kB free_cma:0kB lowmem_reserve[]: 0 0 0 0 0 Node 0 DMA: 0*4kB 1*8kB (U) 1*16kB (U) 1*32kB (U) 1*64kB (U) 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 120kB Node 0 DMA32: 14*4kB (UME) 69*8kB (UME) 27*16kB (UME) 59*32kB (UME) 37*64kB (UME) 18*128kB (UME) 5*256kB (M) 4*512kB (UM) 0*1024kB 0*2048kB 0*4096kB = 10928kB Node 1 Normal: 6*4kB (UME) 9*8kB (UME) 7*16kB (UM) 9*32kB (UME) 10*64kB (ME) 4*128kB (ME) 3*256kB (UME) 3*512kB (ME) 1*1024kB (U) 2*2048kB (UM) 1*4096kB (M) = 13168kB Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=1048576kB Node 0 hugepages_total=2 hugepages_free=2 hugepages_surp=0 hugepages_size=2048kB Node 1 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=1048576kB Node 1 hugepages_total=2 hugepages_free=2 hugepages_surp=0 hugepages_size=2048kB 1909 total pagecache pages 0 pages in swap cache Free swap = 110044kB Total swap = 124996kB 1048443 pages RAM 0 pages HighMem/MovableOnly 281650 pages reserved 0 pages cma reserved