loop0: detected capacity change from 0 to 32768 ======================================================= WARNING: The mand mount option has been deprecated and and is ignored by this kernel. Remove the mand option from the mount to silence this warning. ======================================================= XFS (loop0): Mounting V5 Filesystem bfdc47fc-10d8-4eed-a562-11a831b3f791 XFS (loop0): Ending clean mount XFS (loop0): Quotacheck needed: Please wait. XFS (loop0): Quotacheck: Done. ============================================ WARNING: possible recursive locking detected syzkaller #0 Not tainted -------------------------------------------- syz.0.0/5328 is trying to acquire lock: ffff88804326a698 (&xfs_nondir_ilock_class){++++}-{4:4}, at: xfs_reclaim_inode fs/xfs/xfs_icache.c:1040 [inline] ffff88804326a698 (&xfs_nondir_ilock_class){++++}-{4:4}, at: xfs_icwalk_process_inode fs/xfs/xfs_icache.c:1732 [inline] ffff88804326a698 (&xfs_nondir_ilock_class){++++}-{4:4}, at: xfs_icwalk_ag+0x12c5/0x1ab0 fs/xfs/xfs_icache.c:1814 but task is already holding lock: ffff88804326d018 (&xfs_nondir_ilock_class){++++}-{4:4}, at: xfs_ilock_for_iomap fs/xfs/xfs_iomap.c:789 [inline] ffff88804326d018 (&xfs_nondir_ilock_class){++++}-{4:4}, at: xfs_buffered_write_iomap_begin+0x4d0/0x1890 fs/xfs/xfs_iomap.c:1735 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&xfs_nondir_ilock_class); lock(&xfs_nondir_ilock_class); *** DEADLOCK *** May be due to missing lock nesting notation 5 locks held by syz.0.0/5328: #0: ffff888000712478 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x247/0x320 fs/file.c:1232 #1: ffff88801eb1c420 (sb_writers#12){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3111 [inline] #1: ffff88801eb1c420 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x211/0xb30 fs/read_write.c:682 #2: ffff88804326d230 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: xfs_ilock+0xfe/0x390 fs/xfs/xfs_inode.c:149 #3: ffff88804326d018 (&xfs_nondir_ilock_class){++++}-{4:4}, at: xfs_ilock_for_iomap fs/xfs/xfs_iomap.c:789 [inline] #3: ffff88804326d018 (&xfs_nondir_ilock_class){++++}-{4:4}, at: xfs_buffered_write_iomap_begin+0x4d0/0x1890 fs/xfs/xfs_iomap.c:1735 #4: ffff88801eb1c0e0 (&type->s_umount_key#51){.+.+}-{4:4}, at: super_trylock_shared fs/super.c:562 [inline] #4: ffff88801eb1c0e0 (&type->s_umount_key#51){.+.+}-{4:4}, at: super_cache_scan+0x91/0x4b0 fs/super.c:197 stack backtrace: CPU: 0 UID: 0 PID: 5328 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_deadlock_bug+0x28b/0x2a0 kernel/locking/lockdep.c:3041 check_deadlock kernel/locking/lockdep.c:3093 [inline] validate_chain+0x1a3f/0x2140 kernel/locking/lockdep.c:3895 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 down_write_nested+0x9d/0x200 kernel/locking/rwsem.c:1706 xfs_reclaim_inode fs/xfs/xfs_icache.c:1040 [inline] xfs_icwalk_process_inode fs/xfs/xfs_icache.c:1732 [inline] xfs_icwalk_ag+0x12c5/0x1ab0 fs/xfs/xfs_icache.c:1814 xfs_icwalk fs/xfs/xfs_icache.c:1862 [inline] xfs_reclaim_inodes_nr+0x1e3/0x260 fs/xfs/xfs_icache.c:1106 super_cache_scan+0x41b/0x4b0 fs/super.c:228 do_shrink_slab+0x6ef/0x1110 mm/shrinker.c:437 shrink_slab+0xd74/0x10d0 mm/shrinker.c:664 shrink_one+0x28a/0x7c0 mm/vmscan.c:4955 shrink_many mm/vmscan.c:5016 [inline] lru_gen_shrink_node mm/vmscan.c:5094 [inline] shrink_node+0x315d/0x3780 mm/vmscan.c:6081 shrink_zones mm/vmscan.c:6339 [inline] do_try_to_free_pages+0x668/0x1960 mm/vmscan.c:6401 try_to_free_pages+0x8a2/0xdd0 mm/vmscan.c:6647 __perform_reclaim mm/page_alloc.c:4345 [inline] __alloc_pages_direct_reclaim+0x144/0x300 mm/page_alloc.c:4367 __alloc_pages_slowpath+0x60c/0xcf0 mm/page_alloc.c:4816 __alloc_frozen_pages_noprof+0x319/0x370 mm/page_alloc.c:5196 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416 alloc_frozen_pages_noprof mm/mempolicy.c:2487 [inline] alloc_pages_noprof+0xa9/0x190 mm/mempolicy.c:2507 stack_depot_save_flags+0x777/0x860 lib/stackdepot.c:677 save_stack+0x103/0x1f0 mm/page_owner.c:157 __set_page_owner+0x8d/0x4c0 mm/page_owner.c:332 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1850 prep_new_page mm/page_alloc.c:1858 [inline] get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3884 __alloc_pages_slowpath+0x30b/0xcf0 mm/page_alloc.c:4714 __alloc_frozen_pages_noprof+0x319/0x370 mm/page_alloc.c:5196 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416 alloc_frozen_pages_noprof mm/mempolicy.c:2487 [inline] alloc_pages_noprof+0xa9/0x190 mm/mempolicy.c:2507 stack_depot_save_flags+0x777/0x860 lib/stackdepot.c:677 kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x4f/0x80 mm/kasan/common.c:77 poison_kmalloc_redzone mm/kasan/common.c:400 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:417 kasan_kmalloc include/linux/kasan.h:262 [inline] __kmalloc_cache_noprof+0x3d5/0x6f0 mm/slub.c:5763 kmalloc_noprof include/linux/slab.h:957 [inline] kzalloc_noprof include/linux/slab.h:1094 [inline] xfs_iext_alloc_node fs/xfs/libxfs/xfs_iext_tree.c:401 [inline] xfs_iext_alloc_root fs/xfs/libxfs/xfs_iext_tree.c:593 [inline] xfs_iext_insert_raw+0x249/0x3270 fs/xfs/libxfs/xfs_iext_tree.c:645 xfs_iext_insert+0x36/0x220 fs/xfs/libxfs/xfs_iext_tree.c:684 xfs_bmap_add_extent_hole_delay+0x4aa/0x810 fs/xfs/xfs_iomap.c:1373 xfs_bmapi_reserve_delalloc+0xc45/0xd30 fs/xfs/xfs_iomap.c:1492 xfs_buffered_write_iomap_begin+0x116c/0x1890 fs/xfs/xfs_iomap.c:1907 iomap_iter+0x534/0xde0 fs/iomap/iter.c:108 iomap_file_buffered_write+0x207/0x9b0 fs/iomap/buffered-io.c:1070 xfs_file_buffered_write+0x209/0x8a0 fs/xfs/xfs_file.c:974 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: 0033:0x7f56ee38f6c9 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:00007f56ef213038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f56ee5e5fa0 RCX: 00007f56ee38f6c9 RDX: 000000000208e24b RSI: 0000200000000000 RDI: 0000000000000004 RBP: 00007f56ee411f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f56ee5e6038 R14: 00007f56ee5e5fa0 R15: 00007fffce662268 syz.0.0 (5328) used greatest stack depth: 17256 bytes left