====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.0.0/5360 is trying to acquire lock: ffffffff8e241600 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:318 [inline] ffffffff8e241600 (fs_reclaim){+.+.}-{0:0}, at: prepare_alloc_pages+0x153/0x610 mm/page_alloc.c:4916 but task is already holding lock: ffff8880008d6018 (&xfs_nondir_ilock_class){++++}-{4:4}, at: xfs_ilock_attr_map_shared+0x92/0xd0 fs/xfs/xfs_inode.c:85 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&xfs_nondir_ilock_class){++++}-{4:4}: 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:1042 [inline] xfs_icwalk_process_inode fs/xfs/xfs_icache.c:1734 [inline] xfs_icwalk_ag+0x12c5/0x1ab0 fs/xfs/xfs_icache.c:1816 xfs_icwalk fs/xfs/xfs_icache.c:1864 [inline] xfs_reclaim_inodes_nr+0x1e3/0x260 fs/xfs/xfs_icache.c:1108 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:4954 shrink_many mm/vmscan.c:5015 [inline] lru_gen_shrink_node mm/vmscan.c:5093 [inline] shrink_node+0x314e/0x3760 mm/vmscan.c:6078 kswapd_shrink_node mm/vmscan.c:6938 [inline] balance_pgdat mm/vmscan.c:7121 [inline] kswapd+0x147c/0x2830 mm/vmscan.c:7386 kthread+0x70e/0x8a0 kernel/kthread.c:463 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #0 (fs_reclaim){+.+.}-{0:0}: 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 __fs_reclaim_acquire mm/page_alloc.c:4234 [inline] fs_reclaim_acquire+0x72/0x100 mm/page_alloc.c:4248 might_alloc include/linux/sched/mm.h:318 [inline] prepare_alloc_pages+0x153/0x610 mm/page_alloc.c:4916 __alloc_frozen_pages_noprof+0x123/0x370 mm/page_alloc.c:5137 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 get_free_pages_noprof+0xf/0x80 mm/page_alloc.c:5207 __kasan_populate_vmalloc mm/kasan/shadow.c:362 [inline] kasan_populate_vmalloc+0x33/0x1a0 mm/kasan/shadow.c:417 alloc_vmap_area+0xd51/0x1490 mm/vmalloc.c:2092 __get_vm_area_node+0x1f8/0x300 mm/vmalloc.c:3187 __vmalloc_node_range_noprof+0x301/0x12f0 mm/vmalloc.c:3853 __vmalloc_node_noprof mm/vmalloc.c:3956 [inline] __vmalloc_noprof+0xb1/0xf0 mm/vmalloc.c:3970 xfs_buf_alloc_backing_mem fs/xfs/xfs_buf.c:239 [inline] xfs_buf_alloc+0xed3/0x1d40 fs/xfs/xfs_buf.c:312 xfs_buf_find_insert+0xab/0x1470 fs/xfs/xfs_buf.c:505 xfs_buf_get_map+0x1264/0x1860 fs/xfs/xfs_buf.c:609 xfs_buf_read_map+0x82/0xa50 fs/xfs/xfs_buf.c:702 xfs_buf_read fs/xfs/xfs_buf.h:259 [inline] xfs_attr_rmtval_get+0x5b3/0xba0 fs/xfs/libxfs/xfs_attr_remote.c:434 xfs_attr_node_get+0x150/0x4f0 fs/xfs/libxfs/xfs_attr.c:1532 xfs_attr_get_ilocked+0x330/0x410 fs/xfs/libxfs/xfs_attr.c:248 xfs_attr_get+0x492/0x5e0 fs/xfs/libxfs/xfs_attr.c:289 xfs_xattr_get+0x125/0x1c0 fs/xfs/xfs_xattr.c:150 vfs_getxattr_alloc+0x52c/0x580 fs/xattr.c:404 ima_read_xattr+0x38/0x60 security/integrity/ima/ima_appraise.c:230 process_measurement+0xfd7/0x1a40 security/integrity/ima/ima_main.c:386 ima_file_check+0xd7/0x120 security/integrity/ima/ima_main.c:633 security_file_post_open+0xbb/0x290 security/security.c:3160 do_open fs/namei.c:3889 [inline] path_openat+0x2f26/0x3830 fs/namei.c:4046 do_filp_open+0x1fa/0x410 fs/namei.c:4073 do_sys_openat2+0x121/0x1c0 fs/open.c:1435 do_sys_open fs/open.c:1450 [inline] __do_sys_openat fs/open.c:1466 [inline] __se_sys_openat fs/open.c:1461 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1461 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(&xfs_nondir_ilock_class); lock(fs_reclaim); lock(&xfs_nondir_ilock_class); lock(fs_reclaim); *** DEADLOCK *** 2 locks held by syz.0.0/5360: #0: ffff8880435586c8 (&ima_iint_mutex_key[depth]){+.+.}-{4:4}, at: process_measurement+0x74b/0x1a40 security/integrity/ima/ima_main.c:299 #1: ffff8880008d6018 (&xfs_nondir_ilock_class){++++}-{4:4}, at: xfs_ilock_attr_map_shared+0x92/0xd0 fs/xfs/xfs_inode.c:85 stack backtrace: CPU: 0 UID: 0 PID: 5360 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 __fs_reclaim_acquire mm/page_alloc.c:4234 [inline] fs_reclaim_acquire+0x72/0x100 mm/page_alloc.c:4248 might_alloc include/linux/sched/mm.h:318 [inline] prepare_alloc_pages+0x153/0x610 mm/page_alloc.c:4916 __alloc_frozen_pages_noprof+0x123/0x370 mm/page_alloc.c:5137 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 get_free_pages_noprof+0xf/0x80 mm/page_alloc.c:5207 __kasan_populate_vmalloc mm/kasan/shadow.c:362 [inline] kasan_populate_vmalloc+0x33/0x1a0 mm/kasan/shadow.c:417 alloc_vmap_area+0xd51/0x1490 mm/vmalloc.c:2092 __get_vm_area_node+0x1f8/0x300 mm/vmalloc.c:3187 __vmalloc_node_range_noprof+0x301/0x12f0 mm/vmalloc.c:3853 __vmalloc_node_noprof mm/vmalloc.c:3956 [inline] __vmalloc_noprof+0xb1/0xf0 mm/vmalloc.c:3970 xfs_buf_alloc_backing_mem fs/xfs/xfs_buf.c:239 [inline] xfs_buf_alloc+0xed3/0x1d40 fs/xfs/xfs_buf.c:312 xfs_buf_find_insert+0xab/0x1470 fs/xfs/xfs_buf.c:505 xfs_buf_get_map+0x1264/0x1860 fs/xfs/xfs_buf.c:609 xfs_buf_read_map+0x82/0xa50 fs/xfs/xfs_buf.c:702 xfs_buf_read fs/xfs/xfs_buf.h:259 [inline] xfs_attr_rmtval_get+0x5b3/0xba0 fs/xfs/libxfs/xfs_attr_remote.c:434 xfs_attr_node_get+0x150/0x4f0 fs/xfs/libxfs/xfs_attr.c:1532 xfs_attr_get_ilocked+0x330/0x410 fs/xfs/libxfs/xfs_attr.c:248 xfs_attr_get+0x492/0x5e0 fs/xfs/libxfs/xfs_attr.c:289 xfs_xattr_get+0x125/0x1c0 fs/xfs/xfs_xattr.c:150 vfs_getxattr_alloc+0x52c/0x580 fs/xattr.c:404 ima_read_xattr+0x38/0x60 security/integrity/ima/ima_appraise.c:230 process_measurement+0xfd7/0x1a40 security/integrity/ima/ima_main.c:386 ima_file_check+0xd7/0x120 security/integrity/ima/ima_main.c:633 security_file_post_open+0xbb/0x290 security/security.c:3160 do_open fs/namei.c:3889 [inline] path_openat+0x2f26/0x3830 fs/namei.c:4046 do_filp_open+0x1fa/0x410 fs/namei.c:4073 do_sys_openat2+0x121/0x1c0 fs/open.c:1435 do_sys_open fs/open.c:1450 [inline] __do_sys_openat fs/open.c:1466 [inline] __se_sys_openat fs/open.c:1461 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1461 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f12fdf8ebe9 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:00007f12fed65038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f12fe1c6090 RCX: 00007f12fdf8ebe9 RDX: 0000000000000042 RSI: 0000200000000000 RDI: ffffffffffffff9c RBP: 00007f12fe011e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f12fe1c6128 R14: 00007f12fe1c6090 R15: 00007ffd8e97aba8