BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:1546
in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 6316, name: syz.2.49
preempt_count: 0, expected: 0
RCU nest depth: 1, expected: 0
3 locks held by syz.2.49/6316:
#0: ffff8880341be9b8 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x247/0x310 fs/file.c:1213
#1: ffff88805d998148 (&type->i_mutex_dir_key#16){.+.+}-{4:4}, at: iterate_dir+0x4a6/0x760 fs/readdir.c:101
#2: ffffffff8ed3dfa0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#2: ffffffff8ed3dfa0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#2: ffffffff8ed3dfa0 (rcu_read_lock){....}-{1:3}, at: afs_dynroot_readdir+0x466/0xbe0 fs/afs/dynroot.c:351
CPU: 1 UID: 0 PID: 6316 Comm: syz.2.49 Not tainted 6.15.0-rc1-syzkaller-00325-g7cdabafc0012 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
__might_resched+0x558/0x6c0 kernel/sched/core.c:8818
down_read_killable+0x9c/0xcb0 kernel/locking/rwsem.c:1546
mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:193
get_mmap_lock_carefully mm/memory.c:6355 [inline]
lock_mm_and_find_vma+0x29c/0x2f0 mm/memory.c:6406
do_user_addr_fault arch/x86/mm/fault.c:1360 [inline]
handle_page_fault arch/x86/mm/fault.c:1480 [inline]
exc_page_fault+0x1c1/0x920 arch/x86/mm/fault.c:1538
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:filldir64+0x297/0x690 fs/readdir.c:370
Code: 80 ff 48 89 df 4c 89 f6 e8 b6 a1 80 ff 4c 39 f3 0f 82 5f 02 00 00 48 39 eb 0f 87 56 02 00 00 0f 01 cb 0f ae e8 48 8b 44 24 58 <49> 89 46 08 48 8b 4c 24 18 48 8b 44 24 50 48 89 01 48 8b 44 24 20
RSP: 0018:ffffc90004317be8 EFLAGS: 00050283
RAX: 0000000000000006 RBX: 0000000000000020 RCX: ffff888021749e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000020
RBP: 00007ffffffff000 R08: ffffffff8242a51a R09: 0000000000000004
R10: ffffc90004317bf0 R11: ffffffff8242a2a0 R12: ffff888140ed9661
R13: ffffc90004317e50 R14: 0000000000000000 R15: 0000000000000005
dir_emit include/linux/fs.h:3861 [inline]
afs_dynroot_readdir_cells fs/afs/dynroot.c:310 [inline]
afs_dynroot_readdir+0x814/0xbe0 fs/afs/dynroot.c:352
iterate_dir+0x5a9/0x760 fs/readdir.c:108
__do_sys_getdents64 fs/readdir.c:403 [inline]
__se_sys_getdents64+0x1e4/0x4c0 fs/readdir.c:389
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f420138d169
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:00007f41ff1d5038 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007f42015a6160 RCX: 00007f420138d169
RDX: 0000000000000022 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f420140e990 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f42015a6160 R15: 00007ffd0e8c7678
=============================
[ BUG: Invalid wait context ]
6.15.0-rc1-syzkaller-00325-g7cdabafc0012 #0 Tainted: G W
-----------------------------
syz.2.49/6316 is trying to lock:
ffff88807d326fe0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:193
other info that might help us debug this:
context-{5:5}
3 locks held by syz.2.49/6316:
#0: ffff8880341be9b8 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x247/0x310 fs/file.c:1213
#1: ffff88805d998148 (&type->i_mutex_dir_key#16){.+.+}-{4:4}, at: iterate_dir+0x4a6/0x760 fs/readdir.c:101
#2: ffffffff8ed3dfa0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#2: ffffffff8ed3dfa0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#2: ffffffff8ed3dfa0 (rcu_read_lock){....}-{1:3}, at: afs_dynroot_readdir+0x466/0xbe0 fs/afs/dynroot.c:351
stack backtrace:
CPU: 1 UID: 0 PID: 6316 Comm: syz.2.49 Tainted: G W 6.15.0-rc1-syzkaller-00325-g7cdabafc0012 #0 PREEMPT(full)
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
print_lock_invalid_wait_context kernel/locking/lockdep.c:4831 [inline]
check_wait_context kernel/locking/lockdep.c:4903 [inline]
__lock_acquire+0xc30/0xd80 kernel/locking/lockdep.c:5185
lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866
down_read_killable+0xcb/0xcb0 kernel/locking/rwsem.c:1547
mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:193
get_mmap_lock_carefully mm/memory.c:6355 [inline]
lock_mm_and_find_vma+0x29c/0x2f0 mm/memory.c:6406
do_user_addr_fault arch/x86/mm/fault.c:1360 [inline]
handle_page_fault arch/x86/mm/fault.c:1480 [inline]
exc_page_fault+0x1c1/0x920 arch/x86/mm/fault.c:1538
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:filldir64+0x297/0x690 fs/readdir.c:370
Code: 80 ff 48 89 df 4c 89 f6 e8 b6 a1 80 ff 4c 39 f3 0f 82 5f 02 00 00 48 39 eb 0f 87 56 02 00 00 0f 01 cb 0f ae e8 48 8b 44 24 58 <49> 89 46 08 48 8b 4c 24 18 48 8b 44 24 50 48 89 01 48 8b 44 24 20
RSP: 0018:ffffc90004317be8 EFLAGS: 00050283
RAX: 0000000000000006 RBX: 0000000000000020 RCX: ffff888021749e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000020
RBP: 00007ffffffff000 R08: ffffffff8242a51a R09: 0000000000000004
R10: ffffc90004317bf0 R11: ffffffff8242a2a0 R12: ffff888140ed9661
R13: ffffc90004317e50 R14: 0000000000000000 R15: 0000000000000005
dir_emit include/linux/fs.h:3861 [inline]
afs_dynroot_readdir_cells fs/afs/dynroot.c:310 [inline]
afs_dynroot_readdir+0x814/0xbe0 fs/afs/dynroot.c:352
iterate_dir+0x5a9/0x760 fs/readdir.c:108
__do_sys_getdents64 fs/readdir.c:403 [inline]
__se_sys_getdents64+0x1e4/0x4c0 fs/readdir.c:389
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f420138d169
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:00007f41ff1d5038 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007f42015a6160 RCX: 00007f420138d169
RDX: 0000000000000022 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f420140e990 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f42015a6160 R15: 00007ffd0e8c7678
----------------
Code disassembly (best guess):
0: 80 ff 48 cmp $0x48,%bh
3: 89 df mov %ebx,%edi
5: 4c 89 f6 mov %r14,%rsi
8: e8 b6 a1 80 ff call 0xff80a1c3
d: 4c 39 f3 cmp %r14,%rbx
10: 0f 82 5f 02 00 00 jb 0x275
16: 48 39 eb cmp %rbp,%rbx
19: 0f 87 56 02 00 00 ja 0x275
1f: 0f 01 cb stac
22: 0f ae e8 lfence
25: 48 8b 44 24 58 mov 0x58(%rsp),%rax
* 2a: 49 89 46 08 mov %rax,0x8(%r14) <-- trapping instruction
2e: 48 8b 4c 24 18 mov 0x18(%rsp),%rcx
33: 48 8b 44 24 50 mov 0x50(%rsp),%rax
38: 48 89 01 mov %rax,(%rcx)
3b: 48 8b 44 24 20 mov 0x20(%rsp),%rax