====================================================== WARNING: possible circular locking dependency detected 6.13.0-rc2-syzkaller-00036-g231825b2e1ff #0 Not tainted ------------------------------------------------------ syz.1.16/5982 is trying to acquire lock: ffff888000cd1438 (&q->q_usage_counter(io)#37){++++}-{0:0}, at: __submit_bio+0x2c6/0x560 block/blk-core.c:629 but task is already holding lock: ffffffff8ea35ca0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:3924 [inline] ffffffff8ea35ca0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xd4/0x3c0 mm/page_alloc.c:3949 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (fs_reclaim){+.+.}-{0:0}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 __fs_reclaim_acquire mm/page_alloc.c:3851 [inline] fs_reclaim_acquire+0x88/0x130 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+0xb2/0x4d0 mm/slub.c:4289 __kvmalloc_node_noprof+0x72/0x190 mm/util.c:650 sbitmap_init_node+0x2d4/0x670 lib/sbitmap.c:132 scsi_realloc_sdev_budget_map+0x2a7/0x460 drivers/scsi/scsi_scan.c:246 scsi_add_lun drivers/scsi/scsi_scan.c:1106 [inline] scsi_probe_and_add_lun+0x3173/0x4bd0 drivers/scsi/scsi_scan.c:1287 __scsi_add_device+0x228/0x2f0 drivers/scsi/scsi_scan.c:1622 ata_scsi_scan_host+0x236/0x740 drivers/ata/libata-scsi.c:4575 async_run_entry_fn+0xa8/0x420 kernel/async.c:129 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/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)#37){++++}-{0:0}: check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 bio_queue_enter block/blk.h:75 [inline] blk_mq_submit_bio+0x1536/0x2390 block/blk-mq.c:3092 __submit_bio+0x2c6/0x560 block/blk-core.c:629 __submit_bio_noacct_mq block/blk-core.c:710 [inline] submit_bio_noacct_nocheck+0x4d3/0xe30 block/blk-core.c:739 swap_writepage_bdev_async mm/page_io.c:451 [inline] __swap_writepage+0x747/0x14d0 mm/page_io.c:474 swap_writepage+0x6ee/0xce0 mm/page_io.c:289 pageout mm/vmscan.c:689 [inline] shrink_folio_list+0x3b68/0x5ca0 mm/vmscan.c:1367 evict_folios+0x3c86/0x5800 mm/vmscan.c:4593 try_to_shrink_lruvec+0x9a6/0xc70 mm/vmscan.c:4789 shrink_one+0x3b9/0x850 mm/vmscan.c:4834 shrink_many mm/vmscan.c:4897 [inline] lru_gen_shrink_node mm/vmscan.c:4975 [inline] shrink_node+0x37c5/0x3e50 mm/vmscan.c:5956 shrink_zones mm/vmscan.c:6215 [inline] do_try_to_free_pages+0x78c/0x1cf0 mm/vmscan.c:6277 try_to_free_pages+0x47c/0x1050 mm/vmscan.c:6527 __perform_reclaim mm/page_alloc.c:3927 [inline] __alloc_pages_direct_reclaim+0x178/0x3c0 mm/page_alloc.c:3949 __alloc_pages_slowpath+0x764/0x1020 mm/page_alloc.c:4380 __alloc_pages_noprof+0x49b/0x710 mm/page_alloc.c:4764 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2269 folio_alloc_mpol_noprof+0x36/0x50 mm/mempolicy.c:2287 shmem_alloc_folio mm/shmem.c:1794 [inline] shmem_alloc_and_add_folio+0x4a0/0x1080 mm/shmem.c:1833 shmem_get_folio_gfp+0x621/0x1840 mm/shmem.c:2355 shmem_get_folio mm/shmem.c:2461 [inline] shmem_write_begin+0x165/0x350 mm/shmem.c:3117 generic_perform_write+0x346/0x990 mm/filemap.c:4055 shmem_file_write_iter+0xf9/0x120 mm/shmem.c:3293 new_sync_write fs/read_write.c:586 [inline] vfs_write+0xaeb/0xd30 fs/read_write.c:679 ksys_write+0x18f/0x2b0 fs/read_write.c:731 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(fs_reclaim); lock(&q->q_usage_counter(io)#37); lock(fs_reclaim); rlock(&q->q_usage_counter(io)#37); *** DEADLOCK *** 3 locks held by syz.1.16/5982: #0: ffff88801baec420 (sb_writers#5){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2964 [inline] #0: ffff88801baec420 (sb_writers#5){.+.+}-{0:0}, at: vfs_write+0x225/0xd30 fs/read_write.c:675 #1: ffff888050f60fd8 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:818 [inline] #1: ffff888050f60fd8 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: shmem_file_write_iter+0x80/0x120 mm/shmem.c:3283 #2: ffffffff8ea35ca0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:3924 [inline] #2: ffffffff8ea35ca0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xd4/0x3c0 mm/page_alloc.c:3949 stack backtrace: CPU: 0 UID: 0 PID: 5982 Comm: syz.1.16 Not tainted 6.13.0-rc2-syzkaller-00036-g231825b2e1ff #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+0x241/0x360 lib/dump_stack.c:120 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074 check_noncircular+0x36a/0x4a0 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+0x18ef/0x5920 kernel/locking/lockdep.c:3904 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 bio_queue_enter block/blk.h:75 [inline] blk_mq_submit_bio+0x1536/0x2390 block/blk-mq.c:3092 __submit_bio+0x2c6/0x560 block/blk-core.c:629 __submit_bio_noacct_mq block/blk-core.c:710 [inline] submit_bio_noacct_nocheck+0x4d3/0xe30 block/blk-core.c:739 swap_writepage_bdev_async mm/page_io.c:451 [inline] __swap_writepage+0x747/0x14d0 mm/page_io.c:474 swap_writepage+0x6ee/0xce0 mm/page_io.c:289 pageout mm/vmscan.c:689 [inline] shrink_folio_list+0x3b68/0x5ca0 mm/vmscan.c:1367 evict_folios+0x3c86/0x5800 mm/vmscan.c:4593 try_to_shrink_lruvec+0x9a6/0xc70 mm/vmscan.c:4789 shrink_one+0x3b9/0x850 mm/vmscan.c:4834 shrink_many mm/vmscan.c:4897 [inline] lru_gen_shrink_node mm/vmscan.c:4975 [inline] shrink_node+0x37c5/0x3e50 mm/vmscan.c:5956 shrink_zones mm/vmscan.c:6215 [inline] do_try_to_free_pages+0x78c/0x1cf0 mm/vmscan.c:6277 try_to_free_pages+0x47c/0x1050 mm/vmscan.c:6527 __perform_reclaim mm/page_alloc.c:3927 [inline] __alloc_pages_direct_reclaim+0x178/0x3c0 mm/page_alloc.c:3949 __alloc_pages_slowpath+0x764/0x1020 mm/page_alloc.c:4380 __alloc_pages_noprof+0x49b/0x710 mm/page_alloc.c:4764 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2269 folio_alloc_mpol_noprof+0x36/0x50 mm/mempolicy.c:2287 shmem_alloc_folio mm/shmem.c:1794 [inline] shmem_alloc_and_add_folio+0x4a0/0x1080 mm/shmem.c:1833 shmem_get_folio_gfp+0x621/0x1840 mm/shmem.c:2355 shmem_get_folio mm/shmem.c:2461 [inline] shmem_write_begin+0x165/0x350 mm/shmem.c:3117 generic_perform_write+0x346/0x990 mm/filemap.c:4055 shmem_file_write_iter+0xf9/0x120 mm/shmem.c:3293 new_sync_write fs/read_write.c:586 [inline] vfs_write+0xaeb/0xd30 fs/read_write.c:679 ksys_write+0x18f/0x2b0 fs/read_write.c:731 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f495d17d1ff Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 c9 8d 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 1c 8e 02 00 48 RSP: 002b:00007f495dfdadf0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000001000000 RCX: 00007f495d17d1ff RDX: 0000000001000000 RSI: 00007f4953e00000 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000005b43 R10: 00000000200065c2 R11: 0000000000000293 R12: 0000000000000003 R13: 00007f495dfdaef0 R14: 00007f495dfdaeb0 R15: 00007f4953e00000