(syz.0.0,5314,0):ocfs2_extend_trans:460 ERROR: status = -30 (syz.0.0,5314,0):ocfs2_insert_path:4189 ERROR: status = -30 (syz.0.0,5314,0):ocfs2_do_insert_extent:4345 ERROR: status = -30 (syz.0.0,5314,0):ocfs2_insert_extent:4767 ERROR: status = -30 (syz.0.0,5314,0):ocfs2_add_clusters_in_btree:4860 ERROR: status = -30 (syz.0.0,5314,0):__ocfs2_journal_access:727 ERROR: Error -30 getting 2 access to buffer! (syz.0.0,5314,0):ocfs2_block_group_clear_bits:2491 ERROR: status = -30 (syz.0.0,5314,0):_ocfs2_free_suballoc_bits:2592 ERROR: status = -30 (syz.0.0,5314,0):_ocfs2_free_clusters:2676 ERROR: status = -30 (syz.0.0,5314,0):ocfs2_write_cluster:1131 ERROR: status = -30 (syz.0.0,5314,0):ocfs2_write_cluster_by_desc:1225 ERROR: status = -30 (syz.0.0,5314,0):ocfs2_write_begin_nolock:1798 ERROR: status = -30 ============================================ WARNING: possible recursive locking detected 6.15.0-rc6-syzkaller-00278-g172a9d94339c #0 Not tainted -------------------------------------------- syz.0.0/5314 is trying to acquire lock: ffff88803f434610 (sb_internal#2){.+.+}-{0:0}, at: ocfs2_write_dquot fs/ocfs2/quota_global.c:679 [inline] ffff88803f434610 (sb_internal#2){.+.+}-{0:0}, at: ocfs2_mark_dquot_dirty+0x4a3/0xd10 fs/ocfs2/quota_global.c:954 but task is already holding lock: ffff88803f434610 (sb_internal#2){.+.+}-{0:0}, at: ocfs2_write_begin_nolock+0x26ee/0x4340 fs/ocfs2/aops.c:1748 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(sb_internal#2); lock(sb_internal#2); *** DEADLOCK *** May be due to missing lock nesting notation 9 locks held by syz.0.0/5314: #0: ffff888043a00f18 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1651 [inline] #0: ffff888043a00f18 (sk_lock-AF_INET){+.+.}-{0:0}, at: tcp_recvmsg+0x1fa/0x810 net/ipv4/tcp.c:2877 #1: ffff8880439495e0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_trylock include/linux/mmap_lock.h:203 [inline] #1: ffff8880439495e0 (&mm->mmap_lock){++++}-{4:4}, at: get_mmap_lock_carefully mm/memory.c:6346 [inline] #1: ffff8880439495e0 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x32/0x300 mm/memory.c:6406 #2: ffff88803f434518 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x14d/0x310 mm/memory.c:3287 #3: ffff8880442314a0 (&oi->ip_alloc_sem){++++}-{4:4}, at: ocfs2_page_mkwrite+0x2ff/0xc40 fs/ocfs2/mmap.c:142 #4: ffff8880441f9800 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#2){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline] #4: ffff8880441f9800 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#2){+.+.}-{4:4}, at: ocfs2_reserve_suballoc_bits+0x15e/0x4640 fs/ocfs2/suballoc.c:788 #5: ffff8880441f5100 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#3){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline] #5: ffff8880441f5100 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#3){+.+.}-{4:4}, at: ocfs2_reserve_suballoc_bits+0x15e/0x4640 fs/ocfs2/suballoc.c:788 #6: ffff88803f434610 (sb_internal#2){.+.+}-{0:0}, at: ocfs2_write_begin_nolock+0x26ee/0x4340 fs/ocfs2/aops.c:1748 #7: ffff888035fd04e8 (&journal->j_trans_barrier){.+.+}-{4:4}, at: ocfs2_start_trans+0x36a/0x6d0 fs/ocfs2/journal.c:372 #8: ffffffff8e0bcfd0 (dquot_srcu){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:161 [inline] #8: ffffffff8e0bcfd0 (dquot_srcu){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:253 [inline] #8: ffffffff8e0bcfd0 (dquot_srcu){.+.+}-{0:0}, at: __dquot_free_space+0x18e/0xc00 fs/quota/dquot.c:1901 stack backtrace: CPU: 0 UID: 0 PID: 5314 Comm: syz.0.0 Not tainted 6.15.0-rc6-syzkaller-00278-g172a9d94339c #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:3042 check_deadlock kernel/locking/lockdep.c:3094 [inline] validate_chain+0x1a3f/0x2140 kernel/locking/lockdep.c:3896 __lock_acquire+0xaac/0xd20 kernel/locking/lockdep.c:5235 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 percpu_down_read include/linux/percpu-rwsem.h:52 [inline] __sb_start_write include/linux/fs.h:1783 [inline] sb_start_intwrite include/linux/fs.h:1966 [inline] ocfs2_start_trans+0x26b/0x6d0 fs/ocfs2/journal.c:370 ocfs2_write_dquot fs/ocfs2/quota_global.c:679 [inline] ocfs2_mark_dquot_dirty+0x4a3/0xd10 fs/ocfs2/quota_global.c:954 mark_dquot_dirty fs/quota/dquot.c:370 [inline] mark_all_dquot_dirty+0xfe/0x460 fs/quota/dquot.c:410 __dquot_free_space+0x80b/0xc00 fs/quota/dquot.c:1928 dquot_free_space_nodirty include/linux/quotaops.h:374 [inline] dquot_free_space+0x1b/0x30 include/linux/quotaops.h:379 ocfs2_write_begin_nolock+0x2dd5/0x4340 fs/ocfs2/aops.c:1814 __ocfs2_page_mkwrite fs/ocfs2/mmap.c:93 [inline] ocfs2_page_mkwrite+0x600/0xc40 fs/ocfs2/mmap.c:144 do_page_mkwrite+0x14d/0x310 mm/memory.c:3287 wp_page_shared mm/memory.c:3688 [inline] do_wp_page+0x2626/0x5760 mm/memory.c:3907 handle_pte_fault mm/memory.c:6013 [inline] __handle_mm_fault+0x1028/0x5380 mm/memory.c:6140 handle_mm_fault+0x3f6/0x8c0 mm/memory.c:6309 do_user_addr_fault+0x764/0x1390 arch/x86/mm/fault.c:1388 handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x68/0x110 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:rep_movs_alternative+0x4a/0x90 arch/x86/lib/copy_user_64.S:74 Code: cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 db 83 f9 08 73 e8 eb c5 a4 e9 7f f2 03 00 48 8b 06 48 89 07 48 8d 47 08 48 83 e0 f8 48 RSP: 0018:ffffc9000d4bf1f8 EFLAGS: 00050202 RAX: ffffffff84b68601 RBX: ffff888036378000 RCX: 00000000000037c0 RDX: 0000000000000000 RSI: ffff88803637b8c0 RDI: 000020000001c000 RBP: ffffc9000d4bf358 R08: ffff88803637f07f R09: 1ffff11006c6fe0f R10: dffffc0000000000 R11: ffffed1006c6fe10 R12: 1ffff92001a97fc3 R13: 0000200000018740 R14: ffffc9000d4bfe28 R15: 0000000000007080 copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:147 [inline] copy_to_user_iter lib/iov_iter.c:25 [inline] iterate_ubuf include/linux/iov_iter.h:30 [inline] iterate_and_advance2 include/linux/iov_iter.h:300 [inline] iterate_and_advance include/linux/iov_iter.h:328 [inline] _copy_to_iter+0x24c/0x15a0 lib/iov_iter.c:185 copy_to_iter include/linux/uio.h:220 [inline] simple_copy_to_iter net/core/datagram.c:524 [inline] __skb_datagram_iter+0x3c4/0x960 net/core/datagram.c:434 skb_copy_datagram_iter+0xc5/0x230 net/core/datagram.c:538 skb_copy_datagram_msg include/linux/skbuff.h:4128 [inline] tcp_recvmsg_locked+0xec6/0x3660 net/ipv4/tcp.c:2773 tcp_recvmsg+0x216/0x810 net/ipv4/tcp.c:2878 inet_recvmsg+0x147/0x250 net/ipv4/af_inet.c:883 sock_recvmsg_nosec net/socket.c:1017 [inline] sock_recvmsg+0x1a8/0x270 net/socket.c:1039 ____sys_recvmsg+0x1c9/0x460 net/socket.c:2786 ___sys_recvmsg+0x1b5/0x510 net/socket.c:2828 __sys_recvmsg net/socket.c:2861 [inline] __do_sys_recvmsg net/socket.c:2867 [inline] __se_sys_recvmsg net/socket.c:2864 [inline] __x64_sys_recvmsg+0x198/0x260 net/socket.c:2864 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4a4278e969 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:00007f4a3ebf5038 EFLAGS: 00000246 ORIG_RAX: 000000000000002f RAX: ffffffffffffffda RBX: 00007f4a429b6080 RCX: 00007f4a4278e969 RDX: 0000000000000700 RSI: 0000200000000580 RDI: 0000000000000004 RBP: 00007f4a42810ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f4a429b6080 R15: 00007fff3dffc178 (syz.0.0,5314,0):ocfs2_start_trans:379 ERROR: status = -30 OCFS2: abort (device loop0): handle_t *ocfs2_start_trans(struct ocfs2_super *, int): Detected aborted journal On-disk corruption discovered. Please run fsck.ocfs2 once the filesystem is unmounted. OCFS2: Returning error to the calling process. (syz.0.0,5314,0):ocfs2_write_dquot:682 ERROR: status = -30 (syz.0.0,5314,0):ocfs2_mark_dquot_dirty:983 ERROR: status = -30 (syz.0.0,5314,0):ocfs2_start_trans:379 ERROR: status = -30 OCFS2: abort (device loop0): handle_t *ocfs2_start_trans(struct ocfs2_super *, int): Detected aborted journal On-disk corruption discovered. Please run fsck.ocfs2 once the filesystem is unmounted. OCFS2: Returning error to the calling process. (syz.0.0,5314,0):ocfs2_write_dquot:682 ERROR: status = -30 (syz.0.0,5314,0):ocfs2_mark_dquot_dirty:983 ERROR: status = -30 (syz.0.0,5314,0):__ocfs2_page_mkwrite:97 ERROR: status = -30 (syz.0.0,5314,0):ocfs2_start_trans:379 ERROR: status = -30 OCFS2: abort (device loop0): handle_t *ocfs2_start_trans(struct ocfs2_super *, int): Detected aborted journal On-disk corruption discovered. Please run fsck.ocfs2 once the filesystem is unmounted. OCFS2: Returning error to the calling process. (syz.0.0,5314,0):ocfs2_write_begin_nolock:1751 ERROR: status = -30 (syz.0.0,5314,0):__ocfs2_page_mkwrite:97 ERROR: status = -30 (syz.0.0,5314,0):ocfs2_start_trans:379 ERROR: status = -30 OCFS2: abort (device loop0): handle_t *ocfs2_start_trans(struct ocfs2_super *, int): Detected aborted journal On-disk corruption discovered. Please run fsck.ocfs2 once the filesystem is unmounted. OCFS2: Returning error to the calling process. (syz.0.0,5314,0):ocfs2_write_begin_nolock:1751 ERROR: status = -30 (syz.0.0,5314,0):__ocfs2_page_mkwrite:97 ERROR: status = -30 Zero length message leads to an empty skb ---------------- Code disassembly (best guess): 0: cc int3 1: cc int3 2: cc int3 3: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1) a: 00 00 00 d: 0f 1f 00 nopl (%rax) 10: 48 8b 06 mov (%rsi),%rax 13: 48 89 07 mov %rax,(%rdi) 16: 48 83 c6 08 add $0x8,%rsi 1a: 48 83 c7 08 add $0x8,%rdi 1e: 83 e9 08 sub $0x8,%ecx 21: 74 db je 0xfffffffe 23: 83 f9 08 cmp $0x8,%ecx 26: 73 e8 jae 0x10 28: eb c5 jmp 0xffffffef * 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction 2c: e9 7f f2 03 00 jmp 0x3f2b0 31: 48 8b 06 mov (%rsi),%rax 34: 48 89 07 mov %rax,(%rdi) 37: 48 8d 47 08 lea 0x8(%rdi),%rax 3b: 48 83 e0 f8 and $0xfffffffffffffff8,%rax 3f: 48 rex.W