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. ======================================================= ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode. ====================================================== WARNING: possible circular locking dependency detected 6.11.0-rc7-syzkaller-00020-g8d8d276ba2fb #0 Not tainted ------------------------------------------------------ syz.0.0/5113 is trying to acquire lock: ffff88804bc43f60 (&oi->ip_alloc_sem){++++}-{3:3}, at: ocfs2_page_mkwrite+0x347/0xed0 fs/ocfs2/mmap.c:142 but task is already holding lock: ffff88804ac2e518 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x19b/0x480 mm/memory.c:3142 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (sb_pagefaults){.+.+}-{0:0}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1676 [inline] sb_start_pagefault include/linux/fs.h:1841 [inline] ocfs2_page_mkwrite+0x223/0xed0 fs/ocfs2/mmap.c:122 do_page_mkwrite+0x19b/0x480 mm/memory.c:3142 wp_page_shared mm/memory.c:3545 [inline] do_wp_page+0x23d9/0x52f0 mm/memory.c:3695 handle_pte_fault+0x115a/0x6fc0 mm/memory.c:5537 __handle_mm_fault mm/memory.c:5664 [inline] handle_mm_fault+0x1109/0x1bc0 mm/memory.c:5832 do_user_addr_fault arch/x86/mm/fault.c:1389 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x2b9/0x8c0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 rep_movs_alternative+0x4a/0x70 arch/x86/lib/copy_user_64.S:65 copy_user_generic arch/x86/include/asm/uaccess_64.h:110 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:131 [inline] copy_to_user_iter lib/iov_iter.c:25 [inline] iterate_ubuf include/linux/iov_iter.h:29 [inline] iterate_and_advance2 include/linux/iov_iter.h:245 [inline] iterate_and_advance include/linux/iov_iter.h:271 [inline] _copy_to_iter+0x26b/0x1960 lib/iov_iter.c:185 copy_to_iter include/linux/uio.h:196 [inline] get_random_bytes_user+0x1e5/0x420 drivers/char/random.c:464 __do_sys_getrandom drivers/char/random.c:1406 [inline] __se_sys_getrandom drivers/char/random.c:1380 [inline] __x64_sys_getrandom+0x152/0x250 drivers/char/random.c:1380 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&mm->mmap_lock){++++}-{3:3}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759 __might_fault+0xc6/0x120 mm/memory.c:6387 _inline_copy_to_user include/linux/uaccess.h:176 [inline] _copy_to_user+0x2a/0xb0 lib/usercopy.c:26 copy_to_user include/linux/uaccess.h:209 [inline] fiemap_fill_next_extent+0x235/0x410 fs/ioctl.c:145 ocfs2_fiemap+0x9f1/0xf80 fs/ocfs2/extent_map.c:796 ioctl_fiemap fs/ioctl.c:220 [inline] do_vfs_ioctl+0x1c07/0x2e50 fs/ioctl.c:841 __do_sys_ioctl fs/ioctl.c:905 [inline] __se_sys_ioctl+0x81/0x170 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&oi->ip_alloc_sem){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3133 [inline] check_prevs_add kernel/locking/lockdep.c:3252 [inline] validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3868 __lock_acquire+0x137a/0x2040 kernel/locking/lockdep.c:5142 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759 down_write+0x99/0x220 kernel/locking/rwsem.c:1579 ocfs2_page_mkwrite+0x347/0xed0 fs/ocfs2/mmap.c:142 do_page_mkwrite+0x19b/0x480 mm/memory.c:3142 wp_page_shared mm/memory.c:3545 [inline] do_wp_page+0x23d9/0x52f0 mm/memory.c:3695 handle_pte_fault+0x115a/0x6fc0 mm/memory.c:5537 __handle_mm_fault mm/memory.c:5664 [inline] handle_mm_fault+0x1109/0x1bc0 mm/memory.c:5832 do_user_addr_fault arch/x86/mm/fault.c:1389 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x2b9/0x8c0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 rep_movs_alternative+0x4a/0x70 arch/x86/lib/copy_user_64.S:65 copy_user_generic arch/x86/include/asm/uaccess_64.h:110 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:131 [inline] copy_to_user_iter lib/iov_iter.c:25 [inline] iterate_ubuf include/linux/iov_iter.h:29 [inline] iterate_and_advance2 include/linux/iov_iter.h:245 [inline] iterate_and_advance include/linux/iov_iter.h:271 [inline] _copy_to_iter+0x26b/0x1960 lib/iov_iter.c:185 copy_to_iter include/linux/uio.h:196 [inline] get_random_bytes_user+0x1e5/0x420 drivers/char/random.c:464 __do_sys_getrandom drivers/char/random.c:1406 [inline] __se_sys_getrandom drivers/char/random.c:1380 [inline] __x64_sys_getrandom+0x152/0x250 drivers/char/random.c:1380 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: &oi->ip_alloc_sem --> &mm->mmap_lock --> sb_pagefaults Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(sb_pagefaults); lock(&mm->mmap_lock); lock(sb_pagefaults); lock(&oi->ip_alloc_sem); *** DEADLOCK *** 2 locks held by syz.0.0/5113: #0: ffff888040731e18 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:163 [inline] #0: ffff888040731e18 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5869 [inline] #0: ffff888040731e18 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x32/0x2f0 mm/memory.c:5929 #1: ffff88804ac2e518 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x19b/0x480 mm/memory.c:3142 stack backtrace: CPU: 0 UID: 0 PID: 5113 Comm: syz.0.0 Not tainted 6.11.0-rc7-syzkaller-00020-g8d8d276ba2fb #0 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 lib/dump_stack.c:93 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2186 check_prev_add kernel/locking/lockdep.c:3133 [inline] check_prevs_add kernel/locking/lockdep.c:3252 [inline] validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3868 __lock_acquire+0x137a/0x2040 kernel/locking/lockdep.c:5142 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759 down_write+0x99/0x220 kernel/locking/rwsem.c:1579 ocfs2_page_mkwrite+0x347/0xed0 fs/ocfs2/mmap.c:142 do_page_mkwrite+0x19b/0x480 mm/memory.c:3142 wp_page_shared mm/memory.c:3545 [inline] do_wp_page+0x23d9/0x52f0 mm/memory.c:3695 handle_pte_fault+0x115a/0x6fc0 mm/memory.c:5537 __handle_mm_fault mm/memory.c:5664 [inline] handle_mm_fault+0x1109/0x1bc0 mm/memory.c:5832 do_user_addr_fault arch/x86/mm/fault.c:1389 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x2b9/0x8c0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:rep_movs_alternative+0x4a/0x70 arch/x86/lib/copy_user_64.S:71 Code: 75 f1 c3 cc cc cc cc 66 0f 1f 84 00 00 00 00 00 48 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb c9 a4 c3 cc cc cc cc 48 89 c8 48 c1 e9 03 83 e0 07 f3 48 a5 89 c1 RSP: 0018:ffffc9000b62faf8 EFLAGS: 00050246 RAX: ffffffff84b01901 RBX: 0000000000000040 RCX: 0000000000000040 RDX: 0000000000000000 RSI: ffffc9000b62fd40 RDI: 0000000020000240 RBP: ffffc9000b62fc70 R08: ffffc9000b62fd7f R09: 1ffff920016c5faf R10: dffffc0000000000 R11: fffff520016c5fb0 R12: 1ffff920016c5fc9 R13: 0000000020000240 R14: ffffc9000b62fe48 R15: ffffc9000b62fd40 copy_user_generic arch/x86/include/asm/uaccess_64.h:110 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:131 [inline] copy_to_user_iter lib/iov_iter.c:25 [inline] iterate_ubuf include/linux/iov_iter.h:29 [inline] iterate_and_advance2 include/linux/iov_iter.h:245 [inline] iterate_and_advance include/linux/iov_iter.h:271 [inline] _copy_to_iter+0x26b/0x1960 lib/iov_iter.c:185 copy_to_iter include/linux/uio.h:196 [inline] get_random_bytes_user+0x1e5/0x420 drivers/char/random.c:464 __do_sys_getrandom drivers/char/random.c:1406 [inline] __se_sys_getrandom drivers/char/random.c:1380 [inline] __x64_sys_getrandom+0x152/0x250 drivers/char/random.c:1380 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f375117def9 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:00007f3751e92038 EFLAGS: 00000246 ORIG_RAX: 000000000000013e RAX: ffffffffffffffda RBX: 00007f3751335f80 RCX: 00007f375117def9 RDX: 0000000000000000 RSI: 00000000ffffff9a RDI: 0000000020000240 RBP: 00007f37511f09f6 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f3751335f80 R15: 00007fff8387faa8 ---------------- Code disassembly (best guess): 0: 75 f1 jne 0xfffffff3 2: c3 ret 3: cc int3 4: cc int3 5: cc int3 6: cc int3 7: 66 0f 1f 84 00 00 00 nopw 0x0(%rax,%rax,1) e: 00 00 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 df je 0x2 23: 83 f9 08 cmp $0x8,%ecx 26: 73 e8 jae 0x10 28: eb c9 jmp 0xfffffff3 * 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction 2c: c3 ret 2d: cc int3 2e: cc int3 2f: cc int3 30: cc int3 31: 48 89 c8 mov %rcx,%rax 34: 48 c1 e9 03 shr $0x3,%rcx 38: 83 e0 07 and $0x7,%eax 3b: f3 48 a5 rep movsq %ds:(%rsi),%es:(%rdi) 3e: 89 c1 mov %eax,%ecx