syz.0.0: attempt to access beyond end of device loop0: rw=12288, sector=136, nr_sectors = 2 limit=64 syz.0.0: attempt to access beyond end of device loop0: rw=12288, sector=138, nr_sectors = 2 limit=64 syz.0.0: attempt to access beyond end of device loop0: rw=12288, sector=140, nr_sectors = 2 limit=64 ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.0.0/5330 is trying to acquire lock: ffff888011b90610 (sb_internal#2){.+.+}-{0:0}, at: gfs2_trans_begin+0x6f/0xe0 fs/gfs2/trans.c:118 but task is already holding lock: ffffffff8e048040 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4337 [inline] ffffffff8e048040 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xb8/0x300 mm/page_alloc.c:4362 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (fs_reclaim){+.+.}-{0:0}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 __fs_reclaim_acquire mm/page_alloc.c:4264 [inline] fs_reclaim_acquire+0x72/0x100 mm/page_alloc.c:4278 might_alloc include/linux/sched/mm.h:318 [inline] prepare_alloc_pages+0x153/0x610 mm/page_alloc.c:4946 __alloc_frozen_pages_noprof+0x123/0x370 mm/page_alloc.c:5167 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 folio_alloc_noprof+0x1e/0x30 mm/mempolicy.c:2517 filemap_alloc_folio_noprof+0xdf/0x470 mm/filemap.c:1020 __filemap_get_folio+0x3f2/0xaf0 mm/filemap.c:2012 filemap_grab_folio include/linux/pagemap.h:838 [inline] gfs2_unstuff_dinode+0xe8/0x1320 fs/gfs2/bmap.c:162 gfs2_iomap_begin_write fs/gfs2/bmap.c:1059 [inline] gfs2_iomap_begin+0x9a7/0x11c0 fs/gfs2/bmap.c:1133 iomap_iter+0x534/0xde0 fs/iomap/iter.c:108 iomap_file_buffered_write+0x207/0x9b0 fs/iomap/buffered-io.c:1070 gfs2_file_buffered_write+0x4ed/0x880 fs/gfs2/file.c:1061 gfs2_file_write_iter+0x94e/0x1100 fs/gfs2/file.c:1166 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 -> #2 (&ip->i_rw_mutex){++++}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 down_write+0x96/0x1f0 kernel/locking/rwsem.c:1590 gfs2_unstuff_dinode+0x9d/0x1320 fs/gfs2/bmap.c:161 gfs2_iomap_begin_write fs/gfs2/bmap.c:1059 [inline] gfs2_iomap_begin+0x9a7/0x11c0 fs/gfs2/bmap.c:1133 iomap_iter+0x534/0xde0 fs/iomap/iter.c:108 iomap_file_buffered_write+0x207/0x9b0 fs/iomap/buffered-io.c:1070 gfs2_file_buffered_write+0x4ed/0x880 fs/gfs2/file.c:1061 gfs2_file_write_iter+0x94e/0x1100 fs/gfs2/file.c:1166 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 -> #1 (&sdp->sd_log_flush_lock){.+.+}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 down_read+0x46/0x2e0 kernel/locking/rwsem.c:1537 __gfs2_trans_begin+0x515/0x890 fs/gfs2/trans.c:87 gfs2_trans_begin+0x6f/0xe0 fs/gfs2/trans.c:118 alloc_dinode+0x1e7/0x550 fs/gfs2/inode.c:418 gfs2_create_inode+0xbbc/0x1560 fs/gfs2/inode.c:807 gfs2_atomic_open+0x116/0x200 fs/gfs2/inode.c:1387 atomic_open fs/namei.c:3656 [inline] lookup_open fs/namei.c:3767 [inline] open_last_lookups fs/namei.c:3895 [inline] path_openat+0xf66/0x3830 fs/namei.c:4131 do_filp_open+0x1fa/0x410 fs/namei.c:4161 do_sys_openat2+0x121/0x1c0 fs/open.c:1437 do_sys_open fs/open.c:1452 [inline] __do_sys_openat fs/open.c:1468 [inline] __se_sys_openat fs/open.c:1463 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1463 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 -> #0 (sb_internal#2){.+.+}-{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 percpu_down_read_internal include/linux/percpu-rwsem.h:53 [inline] percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline] __sb_start_write include/linux/fs.h:1916 [inline] sb_start_intwrite include/linux/fs.h:2099 [inline] __gfs2_trans_begin+0x42a/0x890 fs/gfs2/trans.c:76 gfs2_trans_begin+0x6f/0xe0 fs/gfs2/trans.c:118 gfs2_dirty_inode+0x3cb/0x600 fs/gfs2/super.c:508 __mark_inode_dirty+0x2ec/0xe10 fs/fs-writeback.c:2566 mark_inode_dirty_sync include/linux/fs.h:2619 [inline] iput+0x381/0xc50 fs/inode.c:1947 __dentry_kill+0x209/0x660 fs/dcache.c:669 shrink_kill+0xa9/0x2c0 fs/dcache.c:1114 shrink_dentry_list+0x2e0/0x5e0 fs/dcache.c:1141 prune_dcache_sb+0x10e/0x180 fs/dcache.c:1222 super_cache_scan+0x369/0x4b0 fs/super.c:222 do_shrink_slab+0x6ef/0x1110 mm/shrinker.c:437 shrink_slab_memcg mm/shrinker.c:550 [inline] shrink_slab+0x7ef/0x10d0 mm/shrinker.c:628 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:4340 [inline] __alloc_pages_direct_reclaim+0x144/0x300 mm/page_alloc.c:4362 __alloc_pages_slowpath+0x60c/0xcf0 mm/page_alloc.c:4811 __alloc_frozen_pages_noprof+0x319/0x370 mm/page_alloc.c:5191 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416 folio_alloc_mpol_noprof mm/mempolicy.c:2435 [inline] vma_alloc_folio_noprof+0xe4/0x200 mm/mempolicy.c:2470 folio_prealloc+0x30/0x180 mm/memory.c:-1 wp_page_copy mm/memory.c:3680 [inline] do_wp_page+0x1231/0x5800 mm/memory.c:4141 handle_pte_fault mm/memory.c:6211 [inline] __handle_mm_fault+0x1033/0x5400 mm/memory.c:6336 handle_mm_fault+0x40a/0x8e0 mm/memory.c:6505 faultin_page mm/gup.c:1126 [inline] __get_user_pages+0x165c/0x2a00 mm/gup.c:1428 __get_user_pages_locked mm/gup.c:1692 [inline] faultin_page_range+0x240/0x8d0 mm/gup.c:1912 madvise_populate mm/madvise.c:979 [inline] madvise_do_behavior+0x2e7/0x550 mm/madvise.c:1883 do_madvise+0x1bc/0x270 mm/madvise.c:1978 __do_sys_madvise mm/madvise.c:1987 [inline] __se_sys_madvise mm/madvise.c:1985 [inline] __x64_sys_madvise+0xa7/0xc0 mm/madvise.c:1985 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 other info that might help us debug this: Chain exists of: sb_internal#2 --> &ip->i_rw_mutex --> fs_reclaim Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(fs_reclaim); lock(&ip->i_rw_mutex); lock(fs_reclaim); rlock(sb_internal#2); *** DEADLOCK *** 3 locks held by syz.0.0/5330: #0: ffff8880411e4260 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:368 [inline] #0: ffff8880411e4260 (&mm->mmap_lock){++++}-{4:4}, at: madvise_lock+0x14c/0x2d0 mm/madvise.c:1737 #1: ffffffff8e048040 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4337 [inline] #1: ffffffff8e048040 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xb8/0x300 mm/page_alloc.c:4362 #2: ffff888011b900e0 (&type->s_umount_key#50){.+.+}-{4:4}, at: super_trylock_shared fs/super.c:562 [inline] #2: ffff888011b900e0 (&type->s_umount_key#50){.+.+}-{4:4}, at: super_cache_scan+0x91/0x4b0 fs/super.c:197 stack backtrace: CPU: 0 UID: 0 PID: 5330 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 percpu_down_read_internal include/linux/percpu-rwsem.h:53 [inline] percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline] __sb_start_write include/linux/fs.h:1916 [inline] sb_start_intwrite include/linux/fs.h:2099 [inline] __gfs2_trans_begin+0x42a/0x890 fs/gfs2/trans.c:76 gfs2_trans_begin+0x6f/0xe0 fs/gfs2/trans.c:118 gfs2_dirty_inode+0x3cb/0x600 fs/gfs2/super.c:508 __mark_inode_dirty+0x2ec/0xe10 fs/fs-writeback.c:2566 mark_inode_dirty_sync include/linux/fs.h:2619 [inline] iput+0x381/0xc50 fs/inode.c:1947 __dentry_kill+0x209/0x660 fs/dcache.c:669 shrink_kill+0xa9/0x2c0 fs/dcache.c:1114 shrink_dentry_list+0x2e0/0x5e0 fs/dcache.c:1141 prune_dcache_sb+0x10e/0x180 fs/dcache.c:1222 super_cache_scan+0x369/0x4b0 fs/super.c:222 do_shrink_slab+0x6ef/0x1110 mm/shrinker.c:437 shrink_slab_memcg mm/shrinker.c:550 [inline] shrink_slab+0x7ef/0x10d0 mm/shrinker.c:628 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:4340 [inline] __alloc_pages_direct_reclaim+0x144/0x300 mm/page_alloc.c:4362 __alloc_pages_slowpath+0x60c/0xcf0 mm/page_alloc.c:4811 __alloc_frozen_pages_noprof+0x319/0x370 mm/page_alloc.c:5191 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416 folio_alloc_mpol_noprof mm/mempolicy.c:2435 [inline] vma_alloc_folio_noprof+0xe4/0x200 mm/mempolicy.c:2470 folio_prealloc+0x30/0x180 mm/memory.c:-1 wp_page_copy mm/memory.c:3680 [inline] do_wp_page+0x1231/0x5800 mm/memory.c:4141 handle_pte_fault mm/memory.c:6211 [inline] __handle_mm_fault+0x1033/0x5400 mm/memory.c:6336 handle_mm_fault+0x40a/0x8e0 mm/memory.c:6505 faultin_page mm/gup.c:1126 [inline] __get_user_pages+0x165c/0x2a00 mm/gup.c:1428 __get_user_pages_locked mm/gup.c:1692 [inline] faultin_page_range+0x240/0x8d0 mm/gup.c:1912 madvise_populate mm/madvise.c:979 [inline] madvise_do_behavior+0x2e7/0x550 mm/madvise.c:1883 do_madvise+0x1bc/0x270 mm/madvise.c:1978 __do_sys_madvise mm/madvise.c:1987 [inline] __se_sys_madvise mm/madvise.c:1985 [inline] __x64_sys_madvise+0xa7/0xc0 mm/madvise.c:1985 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: 0033:0x7f2c5a78f7c9 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:00007f2c5b60c038 EFLAGS: 00000246 ORIG_RAX: 000000000000001c RAX: ffffffffffffffda RBX: 00007f2c5a9e6090 RCX: 00007f2c5a78f7c9 RDX: 0000000000000017 RSI: 0000000000c00000 RDI: 0000200000000000 RBP: 00007f2c5a813f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f2c5a9e6128 R14: 00007f2c5a9e6090 R15: 00007fffd027e208