loop5: detected capacity change from 0 to 32768 ocfs2: Mounting device (7,5) on (node local, slot 0) with writeback data mode. ====================================================== WARNING: possible circular locking dependency detected 6.16.0-rc4-syzkaller-00324-g1f988d0788f5 #0 Not tainted ------------------------------------------------------ syz.5.3818/20730 is trying to acquire lock: ffff888075edbf60 (&ocfs2_file_ip_alloc_sem_key){++++}-{4:4}, at: ocfs2_page_mkwrite+0x2ff/0xc40 fs/ocfs2/mmap.c:142 but task is already holding lock: ffff888078918520 (sb_pagefaults#8){.+.+}-{0:0}, at: do_page_mkwrite+0x14d/0x310 mm/memory.c:3378 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (sb_pagefaults#8){.+.+}-{0:0}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 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:1795 [inline] sb_start_pagefault include/linux/fs.h:1960 [inline] ocfs2_page_mkwrite+0x1da/0xc40 fs/ocfs2/mmap.c:122 do_page_mkwrite+0x14d/0x310 mm/memory.c:3378 wp_page_shared mm/memory.c:3779 [inline] do_wp_page+0x268d/0x5800 mm/memory.c:3998 handle_pte_fault mm/memory.c:6085 [inline] __handle_mm_fault+0x1144/0x5620 mm/memory.c:6212 handle_mm_fault+0x40a/0x8e0 mm/memory.c:6381 do_user_addr_fault+0x764/0x1390 arch/x86/mm/fault.c:1387 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x76/0xf0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 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+0x247/0x16f0 lib/iov_iter.c:185 copy_page_to_iter+0x10c/0x1c0 lib/iov_iter.c:362 copy_folio_to_iter include/linux/uio.h:204 [inline] filemap_read+0x7c0/0x11a0 mm/filemap.c:2762 ocfs2_file_read_iter+0x3fa/0xa80 fs/ocfs2/file.c:2589 new_sync_read fs/read_write.c:491 [inline] vfs_read+0x4d0/0x980 fs/read_write.c:572 ksys_read+0x145/0x250 fs/read_write.c:715 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 -> #1 (&mm->mmap_lock){++++}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 __might_fault+0xcc/0x130 mm/memory.c:6971 _inline_copy_to_user include/linux/uaccess.h:192 [inline] _copy_to_user+0x2c/0xb0 lib/usercopy.c:26 copy_to_user include/linux/uaccess.h:225 [inline] fiemap_fill_next_extent+0x1c0/0x390 fs/ioctl.c:145 ocfs2_fiemap+0x888/0xc90 fs/ocfs2/extent_map.c:806 ioctl_fiemap fs/ioctl.c:220 [inline] do_vfs_ioctl+0x16d3/0x1990 fs/ioctl.c:841 __do_sys_ioctl fs/ioctl.c:905 [inline] __se_sys_ioctl+0x82/0x170 fs/ioctl.c:893 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 -> #0 (&ocfs2_file_ip_alloc_sem_key){++++}-{4:4}: check_prev_add kernel/locking/lockdep.c:3168 [inline] check_prevs_add kernel/locking/lockdep.c:3287 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3911 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5240 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577 ocfs2_page_mkwrite+0x2ff/0xc40 fs/ocfs2/mmap.c:142 do_page_mkwrite+0x14d/0x310 mm/memory.c:3378 wp_page_shared mm/memory.c:3779 [inline] do_wp_page+0x268d/0x5800 mm/memory.c:3998 handle_pte_fault mm/memory.c:6085 [inline] __handle_mm_fault+0x1144/0x5620 mm/memory.c:6212 handle_mm_fault+0x40a/0x8e0 mm/memory.c:6381 do_user_addr_fault+0x764/0x1390 arch/x86/mm/fault.c:1387 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x76/0xf0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 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+0x247/0x16f0 lib/iov_iter.c:185 copy_page_to_iter+0x10c/0x1c0 lib/iov_iter.c:362 copy_folio_to_iter include/linux/uio.h:204 [inline] filemap_read+0x7c0/0x11a0 mm/filemap.c:2762 ocfs2_file_read_iter+0x3fa/0xa80 fs/ocfs2/file.c:2589 new_sync_read fs/read_write.c:491 [inline] vfs_read+0x4d0/0x980 fs/read_write.c:572 ksys_read+0x145/0x250 fs/read_write.c:715 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: Chain exists of: &ocfs2_file_ip_alloc_sem_key --> &mm->mmap_lock --> sb_pagefaults#8 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(sb_pagefaults#8); lock(&mm->mmap_lock); lock(sb_pagefaults#8); lock(&ocfs2_file_ip_alloc_sem_key); *** DEADLOCK *** 3 locks held by syz.5.3818/20730: #0: ffff888078782478 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x247/0x320 fs/file.c:1217 #1: ffff88807e5c2ce0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_trylock include/linux/mmap_lock.h:431 [inline] #1: ffff88807e5c2ce0 (&mm->mmap_lock){++++}-{4:4}, at: get_mmap_lock_carefully mm/mmap_lock.c:188 [inline] #1: ffff88807e5c2ce0 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x32/0x300 mm/mmap_lock.c:248 #2: ffff888078918520 (sb_pagefaults#8){.+.+}-{0:0}, at: do_page_mkwrite+0x14d/0x310 mm/memory.c:3378 stack backtrace: CPU: 1 UID: 0 PID: 20730 Comm: syz.5.3818 Not tainted 6.16.0-rc4-syzkaller-00324-g1f988d0788f5 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2046 check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2178 check_prev_add kernel/locking/lockdep.c:3168 [inline] check_prevs_add kernel/locking/lockdep.c:3287 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3911 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5240 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577 ocfs2_page_mkwrite+0x2ff/0xc40 fs/ocfs2/mmap.c:142 do_page_mkwrite+0x14d/0x310 mm/memory.c:3378 wp_page_shared mm/memory.c:3779 [inline] do_wp_page+0x268d/0x5800 mm/memory.c:3998 handle_pte_fault mm/memory.c:6085 [inline] __handle_mm_fault+0x1144/0x5620 mm/memory.c:6212 handle_mm_fault+0x40a/0x8e0 mm/memory.c:6381 do_user_addr_fault+0x764/0x1390 arch/x86/mm/fault.c:1387 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x76/0xf0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline] RIP: 0010:raw_copy_to_user arch/x86/include/asm/uaccess_64.h:147 [inline] RIP: 0010:copy_to_user_iter lib/iov_iter.c:25 [inline] RIP: 0010:iterate_ubuf include/linux/iov_iter.h:30 [inline] RIP: 0010:iterate_and_advance2 include/linux/iov_iter.h:300 [inline] RIP: 0010:iterate_and_advance include/linux/iov_iter.h:328 [inline] RIP: 0010:_copy_to_iter+0x247/0x16f0 lib/iov_iter.c:185 Code: e5 01 00 00 e8 da e4 00 fd 48 8b 5c 24 50 48 89 df 4c 8b 7c 24 10 44 89 fe e8 05 6a 64 fd 0f 01 cb 4c 89 ef 4c 89 f9 48 89 de a4 0f 1f 00 0f 01 ca 4c 89 f3 49 29 cf 49 be 00 00 00 00 00 fc RSP: 0018:ffffc9000419f700 EFLAGS: 00050246 RAX: ffffffff84bf7901 RBX: ffff888054f4a050 RCX: 0000000000000fb0 RDX: 0000000000000000 RSI: ffff888054f4a050 RDI: 0000200000001a40 RBP: ffffc9000419f848 R08: ffff888054f4afff R09: 1ffff1100a9e95ff R10: dffffc0000000000 R11: ffffed100a9e9600 R12: 1ffff92000833faf R13: 0000200000001a40 R14: ffffc9000419fd88 R15: 0000000000000fb0 copy_page_to_iter+0x10c/0x1c0 lib/iov_iter.c:362 copy_folio_to_iter include/linux/uio.h:204 [inline] filemap_read+0x7c0/0x11a0 mm/filemap.c:2762 ocfs2_file_read_iter+0x3fa/0xa80 fs/ocfs2/file.c:2589 new_sync_read fs/read_write.c:491 [inline] vfs_read+0x4d0/0x980 fs/read_write.c:572 ksys_read+0x145/0x250 fs/read_write.c:715 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: 0033:0x7fb8ba58e929 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:00007fb8bb352038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007fb8ba7b5fa0 RCX: 00007fb8ba58e929 RDX: 0000000000002020 RSI: 0000200000001a40 RDI: 0000000000000004 RBP: 00007fb8ba610b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fb8ba7b5fa0 R15: 00007ffc037a91b8 (syz.5.3818,20730,1):ocfs2_change_extent_flag:5216 ERROR: Owner 17058 tried to clear 1 flags on an extent that didn't have them (syz.5.3818,20730,1):ocfs2_mark_extent_written:5280 ERROR: status = -5 (syz.5.3818,20730,1):ocfs2_write_cluster:1141 ERROR: status = -5 (syz.5.3818,20730,1):ocfs2_write_cluster_by_desc:1225 ERROR: status = -5 (syz.5.3818,20730,1):ocfs2_write_begin_nolock:1798 ERROR: status = -5 (syz.5.3818,20730,1):__ocfs2_page_mkwrite:97 ERROR: status = -5 ---------------- Code disassembly (best guess): 0: e5 01 in $0x1,%eax 2: 00 00 add %al,(%rax) 4: e8 da e4 00 fd call 0xfd00e4e3 9: 48 8b 5c 24 50 mov 0x50(%rsp),%rbx e: 48 89 df mov %rbx,%rdi 11: 4c 8b 7c 24 10 mov 0x10(%rsp),%r15 16: 44 89 fe mov %r15d,%esi 19: e8 05 6a 64 fd call 0xfd646a23 1e: 0f 01 cb stac 21: 4c 89 ef mov %r13,%rdi 24: 4c 89 f9 mov %r15,%rcx 27: 48 89 de mov %rbx,%rsi * 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction 2c: 0f 1f 00 nopl (%rax) 2f: 0f 01 ca clac 32: 4c 89 f3 mov %r14,%rbx 35: 49 29 cf sub %rcx,%r15 38: 49 rex.WB 39: be 00 00 00 00 mov $0x0,%esi 3e: 00 fc add %bh,%ah