mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium wlan1: deauthenticating from 08:02:11:00:00:00 by local choice (Reason: 1=UNSPECIFIED) ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.0.0/5329 is trying to acquire lock: ffff888011fa2800 (&mm->mmap_lock){++++}-{4:4}, at: gup_fast_fallback+0x20d/0x22e0 mm/gup.c:3204 but task is already holding lock: ffff888012a06130 (&sb->s_type->i_mutex_key#24){++++}-{4:4}, at: xfs_ilock_demote+0xbd/0x290 fs/xfs/xfs_inode.c:285 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&sb->s_type->i_mutex_key#24){++++}-{4:4}: down_read_nested+0x49/0x2e0 kernel/locking/rwsem.c:1662 xfs_ilock+0x109/0x360 fs/xfs/xfs_inode.c:152 xfs_ilock_iocb fs/xfs/xfs_file.c:195 [inline] xfs_file_buffered_read+0x15b/0x330 fs/xfs/xfs_file.c:284 xfs_file_read_iter+0x280/0x510 fs/xfs/xfs_file.c:312 __kernel_read+0x504/0x9b0 fs/read_write.c:530 freader_fetch+0x1cb/0xa00 lib/buildid.c:100 __build_id_parse+0x168/0x870 lib/buildid.c:297 do_procmap_query fs/proc/task_mmu.c:733 [inline] procfs_procmap_ioctl+0x7ae/0xd50 fs/proc/task_mmu.c:813 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (vm_lock){++++}-{0:0}: __vma_enter_locked+0x243/0x710 mm/mmap_lock.c:72 __vma_start_write+0x23/0x140 mm/mmap_lock.c:104 vma_start_write include/linux/mmap_lock.h:213 [inline] mprotect_fixup+0x5e1/0xa50 mm/mprotect.c:768 setup_arg_pages+0x565/0xae0 fs/exec.c:670 load_elf_binary+0xc5e/0x2980 fs/binfmt_elf.c:1028 search_binary_handler fs/exec.c:1669 [inline] exec_binprm fs/exec.c:1701 [inline] bprm_execve+0x93d/0x1410 fs/exec.c:1753 kernel_execve+0x8ef/0x9e0 fs/exec.c:1919 try_to_run_init_process+0x13/0x60 init/main.c:1506 kernel_init+0xad/0x1d0 init/main.c:1634 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 -> #0 (&mm->mmap_lock){++++}-{4:4}: check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x15a5/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0x106/0x330 kernel/locking/lockdep.c:5868 gup_fast_fallback+0x226/0x22e0 mm/gup.c:3204 iov_iter_extract_user_pages lib/iov_iter.c:1763 [inline] iov_iter_extract_pages+0x37b/0x5f0 lib/iov_iter.c:1826 __bio_iov_iter_get_pages block/bio.c:1237 [inline] bio_iov_iter_get_pages+0x4a8/0x14b0 block/bio.c:1359 iomap_dio_bio_iter+0xcb3/0x14d0 fs/iomap/direct-io.c:460 iomap_dio_iter fs/iomap/direct-io.c:-1 [inline] __iomap_dio_rw+0xf57/0x1e10 fs/iomap/direct-io.c:753 iomap_dio_rw+0x45/0xb0 fs/iomap/direct-io.c:847 xfs_file_dio_write_aligned+0x36a/0x450 fs/xfs/xfs_file.c:707 xfs_file_dio_write fs/xfs/xfs_file.c:910 [inline] xfs_file_write_iter+0x7dd/0x920 fs/xfs/xfs_file.c:1122 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x61d/0xb90 fs/read_write.c:686 ksys_write+0x150/0x270 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 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: &mm->mmap_lock --> vm_lock --> &sb->s_type->i_mutex_key#24 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(&sb->s_type->i_mutex_key#24); lock(vm_lock); lock(&sb->s_type->i_mutex_key#24); rlock(&mm->mmap_lock); *** DEADLOCK *** 3 locks held by syz.0.0/5329: #0: ffff8880378077f8 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x246/0x320 fs/file.c:1255 #1: ffff888012646420 (sb_writers#12){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2683 [inline] #1: ffff888012646420 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x227/0xb90 fs/read_write.c:682 #2: ffff888012a06130 (&sb->s_type->i_mutex_key#24){++++}-{4:4}, at: xfs_ilock_demote+0xbd/0x290 fs/xfs/xfs_inode.c:285 stack backtrace: CPU: 0 UID: 0 PID: 5329 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_circular_bug+0x2e1/0x300 kernel/locking/lockdep.c:2043 check_noncircular+0x12e/0x150 kernel/locking/lockdep.c:2175 check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x15a5/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0x106/0x330 kernel/locking/lockdep.c:5868 gup_fast_fallback+0x226/0x22e0 mm/gup.c:3204 iov_iter_extract_user_pages lib/iov_iter.c:1763 [inline] iov_iter_extract_pages+0x37b/0x5f0 lib/iov_iter.c:1826 __bio_iov_iter_get_pages block/bio.c:1237 [inline] bio_iov_iter_get_pages+0x4a8/0x14b0 block/bio.c:1359 iomap_dio_bio_iter+0xcb3/0x14d0 fs/iomap/direct-io.c:460 iomap_dio_iter fs/iomap/direct-io.c:-1 [inline] __iomap_dio_rw+0xf57/0x1e10 fs/iomap/direct-io.c:753 iomap_dio_rw+0x45/0xb0 fs/iomap/direct-io.c:847 xfs_file_dio_write_aligned+0x36a/0x450 fs/xfs/xfs_file.c:707 xfs_file_dio_write fs/xfs/xfs_file.c:910 [inline] xfs_file_write_iter+0x7dd/0x920 fs/xfs/xfs_file.c:1122 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x61d/0xb90 fs/read_write.c:686 ksys_write+0x150/0x270 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7d07d9aeb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f7d08d0d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f7d08015fa0 RCX: 00007f7d07d9aeb9 RDX: 000000000000f000 RSI: 0000200000000200 RDI: 000000000000000c RBP: 00007f7d07e08c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7d08016038 R14: 00007f7d08015fa0 R15: 00007fff3e0a6ad8