loop1: detected capacity change from 0 to 4096 ====================================================== WARNING: possible circular locking dependency detected 6.1.0-rc5-syzkaller-00103-g81ac25651a62 #0 Not tainted ------------------------------------------------------ syz-executor.1/3601 is trying to acquire lock: ffff888033408450 (mapping.invalidate_lock#5){.+.+}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:811 [inline] ffff888033408450 (mapping.invalidate_lock#5){.+.+}-{3:3}, at: filemap_fault+0x2fb/0x1060 mm/filemap.c:3127 but task is already holding lock: ffff8880187b6e18 (&mm->mmap_lock#2){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline] ffff8880187b6e18 (&mm->mmap_lock#2){++++}-{3:3}, at: do_user_addr_fault+0x2e2/0xcb0 arch/x86/mm/fault.c:1369 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&mm->mmap_lock#2){++++}-{3:3}: lock_acquire+0x182/0x3c0 kernel/locking/lockdep.c:5668 down_read+0x39/0x50 kernel/locking/rwsem.c:1509 mmap_read_lock+0x17/0x50 include/linux/mmap_lock.h:117 do_user_addr_fault+0x4b7/0xcb0 arch/x86/mm/fault.c:1379 handle_page_fault arch/x86/mm/fault.c:1519 [inline] exc_page_fault+0x7a/0x110 arch/x86/mm/fault.c:1575 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570 filldir64+0x2df/0x660 fs/readdir.c:331 dir_emit_dotdot include/linux/fs.h:3566 [inline] dir_emit_dots include/linux/fs.h:3577 [inline] exfat_iterate+0x3f8/0x3190 fs/exfat/dir.c:231 iterate_dir+0x257/0x5f0 __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64+0x1db/0x4c0 fs/readdir.c:354 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #1 (&sbi->s_lock#2){+.+.}-{3:3}: lock_acquire+0x182/0x3c0 kernel/locking/lockdep.c:5668 __mutex_lock_common+0x1bd/0x26e0 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:799 exfat_get_block+0x191/0x1e20 fs/exfat/inode.c:282 do_mpage_readpage+0x970/0x1c50 fs/mpage.c:208 mpage_readahead+0x210/0x380 fs/mpage.c:361 read_pages+0x169/0x9c0 mm/readahead.c:161 page_cache_ra_unbounded+0x703/0x820 mm/readahead.c:270 page_cache_sync_readahead include/linux/pagemap.h:1213 [inline] filemap_get_pages+0x465/0x10d0 mm/filemap.c:2581 filemap_read+0x3cf/0xea0 mm/filemap.c:2675 call_read_iter include/linux/fs.h:2185 [inline] generic_file_splice_read+0x1ff/0x5d0 fs/splice.c:309 do_splice_to fs/splice.c:793 [inline] splice_direct_to_actor+0x41b/0xc00 fs/splice.c:865 do_splice_direct+0x279/0x3d0 fs/splice.c:974 do_sendfile+0x5fb/0xf80 fs/read_write.c:1255 __do_sys_sendfile64 fs/read_write.c:1323 [inline] __se_sys_sendfile64+0x14f/0x1b0 fs/read_write.c:1309 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #0 (mapping.invalidate_lock#5){.+.+}-{3:3}: check_prev_add kernel/locking/lockdep.c:3097 [inline] check_prevs_add kernel/locking/lockdep.c:3216 [inline] validate_chain+0x1898/0x6ae0 kernel/locking/lockdep.c:3831 __lock_acquire+0x1292/0x1f60 kernel/locking/lockdep.c:5055 lock_acquire+0x182/0x3c0 kernel/locking/lockdep.c:5668 down_read+0x39/0x50 kernel/locking/rwsem.c:1509 filemap_invalidate_lock_shared include/linux/fs.h:811 [inline] filemap_fault+0x2fb/0x1060 mm/filemap.c:3127 __do_fault+0x136/0x4f0 mm/memory.c:4203 do_read_fault mm/memory.c:4554 [inline] do_fault mm/memory.c:4683 [inline] handle_pte_fault mm/memory.c:4955 [inline] __handle_mm_fault mm/memory.c:5097 [inline] handle_mm_fault+0x27fe/0x3630 mm/memory.c:5218 do_user_addr_fault+0x69b/0xcb0 arch/x86/mm/fault.c:1428 handle_page_fault arch/x86/mm/fault.c:1519 [inline] exc_page_fault+0x7a/0x110 arch/x86/mm/fault.c:1575 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570 strncpy_from_user+0x150/0x330 lib/strncpy_from_user.c:139 getname_flags+0xf5/0x4e0 fs/namei.c:150 do_sys_openat2+0xba/0x4e0 fs/open.c:1304 do_sys_open fs/open.c:1326 [inline] __do_sys_openat fs/open.c:1342 [inline] __se_sys_openat fs/open.c:1337 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1337 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd other info that might help us debug this: Chain exists of: mapping.invalidate_lock#5 --> &sbi->s_lock#2 --> &mm->mmap_lock#2 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&mm->mmap_lock#2); lock(&sbi->s_lock#2); lock(&mm->mmap_lock#2); lock(mapping.invalidate_lock#5); *** DEADLOCK *** 1 lock held by syz-executor.1/3601: #0: ffff8880187b6e18 (&mm->mmap_lock#2){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline] #0: ffff8880187b6e18 (&mm->mmap_lock#2){++++}-{3:3}, at: do_user_addr_fault+0x2e2/0xcb0 arch/x86/mm/fault.c:1369 stack backtrace: CPU: 0 PID: 3601 Comm: syz-executor.1 Not tainted 6.1.0-rc5-syzkaller-00103-g81ac25651a62 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106 check_noncircular+0x2cc/0x390 kernel/locking/lockdep.c:2177 check_prev_add kernel/locking/lockdep.c:3097 [inline] check_prevs_add kernel/locking/lockdep.c:3216 [inline] validate_chain+0x1898/0x6ae0 kernel/locking/lockdep.c:3831 __lock_acquire+0x1292/0x1f60 kernel/locking/lockdep.c:5055 lock_acquire+0x182/0x3c0 kernel/locking/lockdep.c:5668 down_read+0x39/0x50 kernel/locking/rwsem.c:1509 filemap_invalidate_lock_shared include/linux/fs.h:811 [inline] filemap_fault+0x2fb/0x1060 mm/filemap.c:3127 __do_fault+0x136/0x4f0 mm/memory.c:4203 do_read_fault mm/memory.c:4554 [inline] do_fault mm/memory.c:4683 [inline] handle_pte_fault mm/memory.c:4955 [inline] __handle_mm_fault mm/memory.c:5097 [inline] handle_mm_fault+0x27fe/0x3630 mm/memory.c:5218 do_user_addr_fault+0x69b/0xcb0 arch/x86/mm/fault.c:1428 handle_page_fault arch/x86/mm/fault.c:1519 [inline] exc_page_fault+0x7a/0x110 arch/x86/mm/fault.c:1575 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0010:do_strncpy_from_user lib/strncpy_from_user.c:41 [inline] RIP: 0010:strncpy_from_user+0x150/0x330 lib/strncpy_from_user.c:139 Code: 89 34 24 0f 01 cb 0f ae e8 bf 07 00 00 00 4c 89 ee e8 a4 2b 1d fd 49 83 fd 07 0f 86 81 00 00 00 45 31 ff 0f 1f 80 00 00 00 00 <4f> 8b 34 3c 48 b8 ff fe fe fe fe fe fe fe 49 8d 1c 06 4c 89 f5 48 RSP: 0018:ffffc900161afca0 EFLAGS: 00050246 RAX: ffffffff846d7139 RBX: 0000000000000fe0 RCX: 0000000000000002 RDX: ffff88807f0dba80 RSI: 0000000000000fe0 RDI: 0000000000000007 RBP: 0000000000000000 R08: ffffffff846d716c R09: fffff940003c5f01 R10: fffff940003c5f01 R11: 1ffffd40003c5f00 R12: 0000000020000040 R13: 0000000000000fe0 R14: ffff888078be1120 R15: 0000000000000000 getname_flags+0xf5/0x4e0 fs/namei.c:150 do_sys_openat2+0xba/0x4e0 fs/open.c:1304 do_sys_open fs/open.c:1326 [inline] __do_sys_openat fs/open.c:1342 [inline] __se_sys_openat fs/open.c:1337 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1337 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f50d3e8b639 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f50d4c41168 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f50d3fabf80 RCX: 00007f50d3e8b639 RDX: 00000000000005fa RSI: 0000000020000040 RDI: ffffffffffffff9c RBP: 00007f50d3ee6ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcf70e8f3f R14: 00007f50d4c41300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 89 34 24 mov %esi,(%rsp) 3: 0f 01 cb stac 6: 0f ae e8 lfence 9: bf 07 00 00 00 mov $0x7,%edi e: 4c 89 ee mov %r13,%rsi 11: e8 a4 2b 1d fd callq 0xfd1d2bba 16: 49 83 fd 07 cmp $0x7,%r13 1a: 0f 86 81 00 00 00 jbe 0xa1 20: 45 31 ff xor %r15d,%r15d 23: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) * 2a: 4f 8b 34 3c mov (%r12,%r15,1),%r14 <-- trapping instruction 2e: 48 b8 ff fe fe fe fe movabs $0xfefefefefefefeff,%rax 35: fe fe fe 38: 49 8d 1c 06 lea (%r14,%rax,1),%rbx 3c: 4c 89 f5 mov %r14,%rbp 3f: 48 rex.W