====================================================== WARNING: possible circular locking dependency detected 6.12.0-syzkaller-09734-g445d9f05fa14 #0 Not tainted ------------------------------------------------------ syz.1.1207/10011 is trying to acquire lock: ffff8880253900a8 (&q->q_usage_counter(io)#68){++++}-{0:0}, at: bio_queue_enter block/blk.h:79 [inline] ffff8880253900a8 (&q->q_usage_counter(io)#68){++++}-{0:0}, at: blk_mq_submit_bio+0x7ca/0x24c0 block/blk-mq.c:3092 but task is already holding lock: ffffffff8e14eb20 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:3924 [inline] ffffffff8e14eb20 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:3949 [inline] ffffffff8e14eb20 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath mm/page_alloc.c:4380 [inline] ffffffff8e14eb20 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_noprof+0xa8b/0x25a0 mm/page_alloc.c:4764 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (fs_reclaim){+.+.}-{0:0}: __fs_reclaim_acquire mm/page_alloc.c:3851 [inline] fs_reclaim_acquire+0x102/0x150 mm/page_alloc.c:3865 might_alloc include/linux/sched/mm.h:318 [inline] slab_pre_alloc_hook mm/slub.c:4055 [inline] slab_alloc_node mm/slub.c:4133 [inline] __do_kmalloc_node mm/slub.c:4282 [inline] __kmalloc_node_noprof+0xb7/0x520 mm/slub.c:4289 __kvmalloc_node_noprof+0xad/0x1a0 mm/util.c:650 sbitmap_init_node+0x1ca/0x770 lib/sbitmap.c:132 scsi_realloc_sdev_budget_map+0x2c7/0x610 drivers/scsi/scsi_scan.c:246 scsi_add_lun+0x11b4/0x1fd0 drivers/scsi/scsi_scan.c:1106 scsi_probe_and_add_lun+0x4fa/0xda0 drivers/scsi/scsi_scan.c:1287 __scsi_add_device+0x24b/0x290 drivers/scsi/scsi_scan.c:1622 ata_scsi_scan_host+0x215/0x780 drivers/ata/libata-scsi.c:4575 async_run_entry_fn+0x9c/0x530 kernel/async.c:129 process_one_work+0x958/0x1b30 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 -> #0 (&q->q_usage_counter(io)#68){++++}-{0:0}: 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 __bio_queue_enter+0x4c6/0x740 block/blk-core.c:361 bio_queue_enter block/blk.h:79 [inline] blk_mq_submit_bio+0x7ca/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+0x698/0xd70 block/blk-core.c:739 submit_bio_noacct+0x93a/0x1e20 block/blk-core.c:868 swap_writepage_bdev_async mm/page_io.c:451 [inline] __swap_writepage+0x3a3/0xf50 mm/page_io.c:474 swap_writepage+0x403/0x1120 mm/page_io.c:289 pageout+0x3b2/0xaa0 mm/vmscan.c:689 shrink_folio_list+0x3025/0x42d0 mm/vmscan.c:1367 evict_folios+0x6e3/0x19c0 mm/vmscan.c:4593 try_to_shrink_lruvec+0x61e/0xa80 mm/vmscan.c:4789 shrink_one+0x3e3/0x7b0 mm/vmscan.c:4834 shrink_many mm/vmscan.c:4897 [inline] lru_gen_shrink_node mm/vmscan.c:4975 [inline] shrink_node+0xbf0/0x3f20 mm/vmscan.c:5956 shrink_zones mm/vmscan.c:6215 [inline] do_try_to_free_pages+0x35f/0x1a30 mm/vmscan.c:6277 try_to_free_pages+0x2ae/0x6b0 mm/vmscan.c:6527 __perform_reclaim mm/page_alloc.c:3927 [inline] __alloc_pages_direct_reclaim mm/page_alloc.c:3949 [inline] __alloc_pages_slowpath mm/page_alloc.c:4380 [inline] __alloc_pages_noprof+0xb0c/0x25a0 mm/page_alloc.c:4764 alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2265 folio_alloc_mpol_noprof+0x36/0xd0 mm/mempolicy.c:2283 vma_alloc_folio_noprof+0xee/0x1b0 mm/mempolicy.c:2313 folio_prealloc mm/memory.c:1060 [inline] alloc_anon_folio mm/memory.c:4752 [inline] do_anonymous_page mm/memory.c:4809 [inline] do_pte_missing+0x2017/0x3e00 mm/memory.c:3977 handle_pte_fault mm/memory.c:5801 [inline] __handle_mm_fault+0x103c/0x2a40 mm/memory.c:5944 handle_mm_fault+0x3fa/0xaa0 mm/memory.c:6112 do_user_addr_fault+0x60d/0x13f0 arch/x86/mm/fault.c:1338 handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(fs_reclaim); lock(&q->q_usage_counter(io)#68); lock(fs_reclaim); rlock(&q->q_usage_counter(io)#68); *** DEADLOCK *** 2 locks held by syz.1.1207/10011: #0: ffff888069fa5df0 (&vma->vm_lock->lock){++++}-{4:4}, at: vma_start_read include/linux/mm.h:716 [inline] #0: ffff888069fa5df0 (&vma->vm_lock->lock){++++}-{4:4}, at: lock_vma_under_rcu+0x13e/0x980 mm/memory.c:6278 #1: ffffffff8e14eb20 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:3924 [inline] #1: ffffffff8e14eb20 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:3949 [inline] #1: ffffffff8e14eb20 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath mm/page_alloc.c:4380 [inline] #1: ffffffff8e14eb20 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_noprof+0xa8b/0x25a0 mm/page_alloc.c:4764 stack backtrace: CPU: 2 UID: 0 PID: 10011 Comm: syz.1.1207 Not tainted 6.12.0-syzkaller-09734-g445d9f05fa14 #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+0x41c/0x610 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 __bio_queue_enter+0x4c6/0x740 block/blk-core.c:361 bio_queue_enter block/blk.h:79 [inline] blk_mq_submit_bio+0x7ca/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+0x698/0xd70 block/blk-core.c:739 submit_bio_noacct+0x93a/0x1e20 block/blk-core.c:868 swap_writepage_bdev_async mm/page_io.c:451 [inline] __swap_writepage+0x3a3/0xf50 mm/page_io.c:474 swap_writepage+0x403/0x1120 mm/page_io.c:289 pageout+0x3b2/0xaa0 mm/vmscan.c:689 shrink_folio_list+0x3025/0x42d0 mm/vmscan.c:1367 evict_folios+0x6e3/0x19c0 mm/vmscan.c:4593 try_to_shrink_lruvec+0x61e/0xa80 mm/vmscan.c:4789 shrink_one+0x3e3/0x7b0 mm/vmscan.c:4834 shrink_many mm/vmscan.c:4897 [inline] lru_gen_shrink_node mm/vmscan.c:4975 [inline] shrink_node+0xbf0/0x3f20 mm/vmscan.c:5956 shrink_zones mm/vmscan.c:6215 [inline] do_try_to_free_pages+0x35f/0x1a30 mm/vmscan.c:6277 try_to_free_pages+0x2ae/0x6b0 mm/vmscan.c:6527 __perform_reclaim mm/page_alloc.c:3927 [inline] __alloc_pages_direct_reclaim mm/page_alloc.c:3949 [inline] __alloc_pages_slowpath mm/page_alloc.c:4380 [inline] __alloc_pages_noprof+0xb0c/0x25a0 mm/page_alloc.c:4764 alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2265 folio_alloc_mpol_noprof+0x36/0xd0 mm/mempolicy.c:2283 vma_alloc_folio_noprof+0xee/0x1b0 mm/mempolicy.c:2313 folio_prealloc mm/memory.c:1060 [inline] alloc_anon_folio mm/memory.c:4752 [inline] do_anonymous_page mm/memory.c:4809 [inline] do_pte_missing+0x2017/0x3e00 mm/memory.c:3977 handle_pte_fault mm/memory.c:5801 [inline] __handle_mm_fault+0x103c/0x2a40 mm/memory.c:5944 handle_mm_fault+0x3fa/0xaa0 mm/memory.c:6112 do_user_addr_fault+0x60d/0x13f0 arch/x86/mm/fault.c:1338 handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0023:0xf71b2622 Code: 85 f6 74 22 83 ec 04 01 f0 ff 74 24 4c ff 74 24 3c 50 8b 5c 24 1c e8 ad 93 03 00 83 c4 10 85 c0 0f 85 62 01 00 00 8b 44 24 44 <89> bd 64 02 00 00 c7 45 0c 01 00 00 00 89 85 60 02 00 00 8b 44 24 RSP: 002b:00000000ffbbdd00 EFLAGS: 00010246 RAX: 00000000f4c01000 RBX: 00000000f7390ff4 RCX: 0000000000020000 RDX: 0000000000000003 RSI: 0000000000001000 RDI: 0000000000021000 RBP: 00000000f4c21b40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000286 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ---------------- Code disassembly (best guess): 0: 85 f6 test %esi,%esi 2: 74 22 je 0x26 4: 83 ec 04 sub $0x4,%esp 7: 01 f0 add %esi,%eax 9: ff 74 24 4c push 0x4c(%rsp) d: ff 74 24 3c push 0x3c(%rsp) 11: 50 push %rax 12: 8b 5c 24 1c mov 0x1c(%rsp),%ebx 16: e8 ad 93 03 00 call 0x393c8 1b: 83 c4 10 add $0x10,%esp 1e: 85 c0 test %eax,%eax 20: 0f 85 62 01 00 00 jne 0x188 26: 8b 44 24 44 mov 0x44(%rsp),%eax * 2a: 89 bd 64 02 00 00 mov %edi,0x264(%rbp) <-- trapping instruction 30: c7 45 0c 01 00 00 00 movl $0x1,0xc(%rbp) 37: 89 85 60 02 00 00 mov %eax,0x260(%rbp) 3d: 8b .byte 0x8b 3e: 44 rex.R 3f: 24 .byte 0x24