====================================================== WARNING: possible circular locking dependency detected 6.12.0-rc5-syzkaller-00005-ge42b1a9a2557 #0 Not tainted ------------------------------------------------------ syz.0.4280/1696 is trying to acquire lock: ffff88807f3bea18 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock_killable include/linux/mmap_lock.h:153 [inline] ffff88807f3bea18 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:6112 [inline] ffff88807f3bea18 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x3a9/0x6a0 mm/memory.c:6163 but task is already holding lock: ffff888027411ce8 (&sb->s_type->i_mutex_key#12){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:815 [inline] ffff888027411ce8 (&sb->s_type->i_mutex_key#12){+.+.}-{3:3}, at: shmem_file_write_iter+0x86/0x140 mm/shmem.c:3206 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&sb->s_type->i_mutex_key#12){+.+.}-{3:3}: down_write+0x93/0x200 kernel/locking/rwsem.c:1577 inode_lock include/linux/fs.h:815 [inline] process_measurement+0x39c/0x2370 security/integrity/ima/ima_main.c:250 ima_file_mmap+0x146/0x1d0 security/integrity/ima/ima_main.c:455 security_mmap_file+0x8bd/0x990 security/security.c:2979 __do_sys_remap_file_pages+0x526/0x900 mm/mmap.c:1702 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&mm->mmap_lock){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain kernel/locking/lockdep.c:3904 [inline] __lock_acquire+0x250b/0x3ce0 kernel/locking/lockdep.c:5202 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5825 down_read_killable+0x9d/0x380 kernel/locking/rwsem.c:1547 mmap_read_lock_killable include/linux/mmap_lock.h:153 [inline] get_mmap_lock_carefully mm/memory.c:6112 [inline] lock_mm_and_find_vma+0x3a9/0x6a0 mm/memory.c:6163 do_user_addr_fault+0x2b5/0x13f0 arch/x86/mm/fault.c:1361 handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 fault_in_readable+0xee/0x200 mm/gup.c:2228 fault_in_iov_iter_readable+0x101/0x2c0 lib/iov_iter.c:94 generic_perform_write+0x21b/0x920 mm/filemap.c:4044 shmem_file_write_iter+0x10e/0x140 mm/shmem.c:3216 new_sync_write fs/read_write.c:590 [inline] vfs_write+0x5ae/0x1150 fs/read_write.c:683 ksys_write+0x12f/0x260 fs/read_write.c:736 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sb->s_type->i_mutex_key#12); lock(&mm->mmap_lock); lock(&sb->s_type->i_mutex_key#12); rlock(&mm->mmap_lock); *** DEADLOCK *** 3 locks held by syz.0.4280/1696: #0: ffff888047e78b78 (&f->f_pos_lock){+.+.}-{3:3}, at: fdget_pos+0x24c/0x360 fs/file.c:1160 #1: ffff88807a5d2420 (sb_writers#5){.+.+}-{0:0}, at: ksys_write+0x12f/0x260 fs/read_write.c:736 #2: ffff888027411ce8 (&sb->s_type->i_mutex_key#12){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:815 [inline] #2: ffff888027411ce8 (&sb->s_type->i_mutex_key#12){+.+.}-{3:3}, at: shmem_file_write_iter+0x86/0x140 mm/shmem.c:3206 stack backtrace: CPU: 0 UID: 0 PID: 1696 Comm: syz.0.4280 Not tainted 6.12.0-rc5-syzkaller-00005-ge42b1a9a2557 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_circular_bug+0x419/0x5d0 kernel/locking/lockdep.c:2074 check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2206 check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain kernel/locking/lockdep.c:3904 [inline] __lock_acquire+0x250b/0x3ce0 kernel/locking/lockdep.c:5202 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5825 down_read_killable+0x9d/0x380 kernel/locking/rwsem.c:1547 mmap_read_lock_killable include/linux/mmap_lock.h:153 [inline] get_mmap_lock_carefully mm/memory.c:6112 [inline] lock_mm_and_find_vma+0x3a9/0x6a0 mm/memory.c:6163 do_user_addr_fault+0x2b5/0x13f0 arch/x86/mm/fault.c:1361 handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:fault_in_readable+0xee/0x200 mm/gup.c:2228 Code: 01 cb 0f ae e8 4d 89 ee 31 ff 41 81 e6 ff 0f 00 00 4c 89 f6 e8 43 39 ba ff 4d 85 f6 0f 84 f2 00 00 00 e8 c5 36 ba ff 45 31 f6 <41> 8a 45 00 31 ff 44 89 f6 88 44 24 28 e8 f0 38 ba ff 45 85 f6 0f RSP: 0000:ffffc900041a7b18 EFLAGS: 00050246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81d26f1d RDX: ffff88802f7f0000 RSI: ffffffff81d26f2b RDI: 0000000000000007 RBP: 00000000000ffff9 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000ff9 R11: 0000000000000000 R12: 0000000000076000 R13: 0000000000089ff9 R14: 0000000000000000 R15: 1ffff92000834f64 fault_in_iov_iter_readable+0x101/0x2c0 lib/iov_iter.c:94 generic_perform_write+0x21b/0x920 mm/filemap.c:4044 shmem_file_write_iter+0x10e/0x140 mm/shmem.c:3216 new_sync_write fs/read_write.c:590 [inline] vfs_write+0x5ae/0x1150 fs/read_write.c:683 ksys_write+0x12f/0x260 fs/read_write.c:736 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff1a717e719 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:00007ff1a7f74038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007ff1a7336130 RCX: 00007ff1a717e719 RDX: 0000000000100082 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007ff1a71f132e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ff1a7336130 R15: 00007fff22e72cc8 ---------------- Code disassembly (best guess): 0: 01 cb add %ecx,%ebx 2: 0f ae e8 lfence 5: 4d 89 ee mov %r13,%r14 8: 31 ff xor %edi,%edi a: 41 81 e6 ff 0f 00 00 and $0xfff,%r14d 11: 4c 89 f6 mov %r14,%rsi 14: e8 43 39 ba ff call 0xffba395c 19: 4d 85 f6 test %r14,%r14 1c: 0f 84 f2 00 00 00 je 0x114 22: e8 c5 36 ba ff call 0xffba36ec 27: 45 31 f6 xor %r14d,%r14d * 2a: 41 8a 45 00 mov 0x0(%r13),%al <-- trapping instruction 2e: 31 ff xor %edi,%edi 30: 44 89 f6 mov %r14d,%esi 33: 88 44 24 28 mov %al,0x28(%rsp) 37: e8 f0 38 ba ff call 0xffba392c 3c: 45 85 f6 test %r14d,%r14d 3f: 0f .byte 0xf