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BUG: sleeping function called from invalid context in alloc_buffer_head

Status: upstream: reported on 2023/05/09 11:45
Subsystems: mm
[Documentation on labels]
Reported-by: syzbot+3c6cac1550288f8e7060@syzkaller.appspotmail.com
Fix commit: workingset: add missing rcu_read_unlock() in lru_gen_refault()
Patched on: [ci-upstream-linux-next-kasan-gce-root], missing on: [ci-qemu-gce-upstream-auto ci-qemu-native-arm64-kvm ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-qemu2-riscv64 ci-snapshot-upstream-root ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-arm64 ci-upstream-gce-leak ci-upstream-kasan-badwrites-root ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce-386-root ci-upstream-kmsan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci-upstream-rust-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce ci2-upstream-usb]
First crash: 1118d, last: 1108d
▶ ▼ ✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision Error
f95205a0-d661-4368-b9d3-13d4886c85c7 assessment-security 💥 BUG: sleeping function called from invalid context in alloc_buffer_head 2026/05/25 12:16 2026/05/25 12:16 2026/05/25 12:38 c69befb30ac10e158cc9d1557b508ee3f0eca1de failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=x86_64" "CC=ccache clang" "LD=ld.lld" "O=/app/workdir/cache/build/830d3bd07fc7b8cf4cb29866101ad6046763a214" "-s" "bzImage" "compile_commands.json"]: exit status 2 Root cause: include/linux/thread_info.h:244:4: error: call to '__bad_copy_from' declared with 'error' attribute: copy source size is too small * * Restart config... * * * Mitigations for speculative execution vulnerabilities * Mitigations for speculative execution vulnerabilities (SPECULATION_MITIGATIONS) [Y/n/?] y Remove the kernel mapping in user mode (PAGE_TABLE_ISOLATION) [N/y/?] n Avoid speculative indirect branches in kernel (RETPOLINE) [N/y/?] n Enable IBPB on kernel entry (CPU_IBPB_ENTRY) [Y/n/?] y Enable IBRS on kernel entry (CPU_IBRS_ENTRY) [Y/n/?] y Mitigate Straight-Line-Speculation (SLS) [N/y/?] (NEW) Error in reading or end of file. * * General architecture-dependent options * Kprobes (KPROBES) [N/y/?] n Optimize very unlikely/likely branches (JUMP_LABEL) [Y/n/?] y Static key selftest (STATIC_KEYS_SELFTEST) [N/y/?] n Static call selftest (STATIC_CALL_SELFTEST) [N/y/?] n Enable seccomp to safely execute untrusted bytecode (SECCOMP) [Y/n/?] y Show seccomp filter cache status in /proc/pid/seccomp_cache (SECCOMP_CACHE_DEBUG) [N/y/?] n Link Time Optimization (LTO) > 1. None (LTO_NONE) choice[1]: 1 Use Clang's Control Flow Integrity (CFI) (CFI_CLANG) [N/y/?] (NEW) Error in reading or end of file. Number of bits to use for ASLR of mmap base address (ARCH_MMAP_RND_BITS) [28] 28 Number of bits to use for ASLR of mmap base address for compatible applications (ARCH_MMAP_RND_COMPAT_BITS) [8] 8 Provide system calls for 32-bit time_t (COMPAT_32BIT_TIME) [Y/n/?] y Use a virtually-mapped stack (VMAP_STACK) [Y/n/?] y Support for randomizing kernel stack offset on syscall entry (RANDOMIZE_KSTACK_OFFSET) [Y/n/?] y Default state of kernel stack offset randomization (RANDOMIZE_KSTACK_OFFSET_DEFAULT) [N/y/?] n Locking event counts collection (LOCK_EVENT_COUNTS) [N/y/?] n * * Memory initialization * Initialize kernel stack variables at function entry > 1. no automatic stack variable initialization (weakest) (INIT_STACK_NONE) 2. pattern-init everything (strongest) (INIT_STACK_ALL_PATTERN) (NEW) 3. zero-init everything (strongest and safest) (INIT_STACK_ALL_ZERO) (NEW) choice[1-3?]: Error in reading or end of file. Enable heap memory zeroing on allocation by default (INIT_ON_ALLOC_DEFAULT_ON) [Y/n/?] y Enable heap memory zeroing on free by default (INIT_ON_FREE_DEFAULT_ON) [N/y/?] n Enable register zeroing on function exit (ZERO_CALL_USED_REGS) [N/y/?] (NEW) Error in reading or end of file. * * Kernel hardening options * Randomize layout of sensitive kernel structures > 1. Disable structure layout randomization (RANDSTRUCT_NONE) 2. Fully randomize structure layout (RANDSTRUCT_FULL) (NEW) choice[1-2?]: Error in reading or end of file. * * Compile-time checks and compiler options * Debug information 1. Disable debug information (DEBUG_INFO_NONE) 2. Rely on the toolchain's implicit default DWARF version (DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT) > 3. Generate DWARF Version 4 debuginfo (DEBUG_INFO_DWARF4) 4. Generate DWARF Version 5 debuginfo (DEBUG_INFO_DWARF5) choice[1-4?]: 3 Reduce debugging information (DEBUG_INFO_REDUCED) [N/y/?] n Compressed Debug information > 1. Don't compress debug information (DEBUG_INFO_COMPRESSED_NONE) 2. Compress debugging information with zlib (DEBUG_INFO_COMPRESSED_ZLIB) 3. Compress debugging information with zstd (DEBUG_INFO_COMPRESSED_ZSTD) (NEW) choice[1-3?]: Error in reading or end of file. Produce split debuginfo in .dwo files (DEBUG_INFO_SPLIT) [N/y/?] n Generate BTF typeinfo (DEBUG_INFO_BTF) [N/y/?] n Provide GDB scripts for kernel debugging (GDB_SCRIPTS) [N/y/?] n Warn for stack frames larger than (FRAME_WARN) [2048] 2048 Strip assembler-generated symbols during link (STRIP_ASM_SYMS) [N/y/?] n Install uapi headers to usr/include (HEADERS_INSTALL) [N/y/?] n Make section mismatch errors no
▶ ▼ Duplicate bugs (1)
Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
BUG: sleeping function called from invalid context in mempool_alloc fs mm 5 1 1113d 1111d 0/29 closed as dup on 2023/05/12 13:28
▶ ▼ Discussions (3)
Title Replies (including bot) Last reply
Re: [syzbot] [ext4?] BUG: sleeping function called from invalid context in alloc_buffer_head 1 (1) 2023/05/10 19:03
[syzbot] [ext4?] BUG: sleeping function called from invalid context in alloc_buffer_head 1 (2) 2023/05/10 18:59
[PATCH] workingset: add missing rcu_read_unlock() in lru_gen_refault() 3 (3) 2023/05/09 23:59

Sample crash report:
BUG: sleeping function called from invalid context at include/linux/sched/mm.h:306
in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 6396, name: modprobe
preempt_count: 0, expected: 0
RCU nest depth: 1, expected: 0
2 locks held by modprobe/6396:
 #0: ffff88801e210400 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:785 [inline]
 #0: ffff88801e210400 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: lookup_slow fs/namei.c:1706 [inline]
 #0: ffff88801e210400 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: walk_component+0x332/0x5a0 fs/namei.c:1998
 #1: ffffffff8c7991c0 (rcu_read_lock){....}-{1:2}, at: lru_gen_refault mm/workingset.c:293 [inline]
 #1: ffffffff8c7991c0 (rcu_read_lock){....}-{1:2}, at: workingset_refault+0x175/0x11e0 mm/workingset.c:528
CPU: 1 PID: 6396 Comm: modprobe Not tainted 6.4.0-rc1-next-20230512-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x136/0x150 lib/dump_stack.c:106
 __might_resched+0x358/0x580 kernel/sched/core.c:10148
 might_alloc include/linux/sched/mm.h:306 [inline]
 slab_pre_alloc_hook mm/slab.h:670 [inline]
 slab_alloc_node mm/slub.c:3433 [inline]
 slab_alloc mm/slub.c:3459 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3466 [inline]
 kmem_cache_alloc+0x357/0x3b0 mm/slub.c:3475
 kmem_cache_zalloc include/linux/slab.h:670 [inline]
 alloc_buffer_head+0x24/0x150 fs/buffer.c:3044
 folio_alloc_buffers+0x2f2/0x810 fs/buffer.c:941
 alloc_page_buffers fs/buffer.c:976 [inline]
 grow_dev_page fs/buffer.c:1084 [inline]
 grow_buffers fs/buffer.c:1130 [inline]
 __getblk_slow+0x612/0x1230 fs/buffer.c:1157
 __getblk_gfp+0x72/0x80 fs/buffer.c:1452
 sb_getblk include/linux/buffer_head.h:369 [inline]
 __ext4_get_inode_loc+0x4ab/0x1330 fs/ext4/inode.c:4376
 __ext4_get_inode_loc_noinmem+0xb9/0x160 fs/ext4/inode.c:4489
 __ext4_iget+0x426/0x4430 fs/ext4/inode.c:4686
 ext4_lookup fs/ext4/namei.c:1851 [inline]
 ext4_lookup+0x387/0x700 fs/ext4/namei.c:1826
 __lookup_slow+0x24c/0x460 fs/namei.c:1690
 lookup_slow fs/namei.c:1707 [inline]
 walk_component+0x33f/0x5a0 fs/namei.c:1998
 link_path_walk.part.0+0x74e/0xd60 fs/namei.c:2325
 link_path_walk fs/namei.c:2250 [inline]
 path_openat+0x25c/0x2750 fs/namei.c:3787
 do_filp_open+0x1ba/0x410 fs/namei.c:3818
 do_sys_openat2+0x16d/0x4c0 fs/open.c:1356
 do_sys_open fs/open.c:1372 [inline]
 __do_sys_openat fs/open.c:1388 [inline]
 __se_sys_openat fs/open.c:1383 [inline]
 __x64_sys_openat+0x143/0x1f0 fs/open.c:1383
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f2737aada46
Code: 10 00 00 00 44 8b 54 24 e0 48 89 44 24 c0 48 8d 44 24 d0 48 89 44 24 c8 44 89 c2 4c 89 ce bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 76 0c f7 d8 89 05 0a 48 01 00 48 83 c8 ff c3 31
RSP: 002b:00007ffff7f33bb8 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007ffff7f33e18 RCX: 00007f2737aada46
RDX: 0000000000080000 RSI: 00007ffff7f33c30 RDI: 00000000ffffff9c
RBP: 00007ffff7f33c20 R08: 0000000000080000 R09: 00007ffff7f33c30
R10: 0000000000000000 R11: 0000000000000287 R12: 00007ffff7f33c30
R13: 0000000000000000 R14: 00007ffff7f33dff R15: 00000000ffffffff
 </TASK>
------------[ cut here ]------------
Voluntary context switch within RCU read-side critical section!
WARNING: CPU: 0 PID: 6396 at kernel/rcu/tree_plugin.h:320 rcu_note_context_switch+0xbb9/0x1800 kernel/rcu/tree_plugin.h:320
Modules linked in:
CPU: 0 PID: 6396 Comm: modprobe Tainted: G        W          6.4.0-rc1-next-20230512-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
RIP: 0010:rcu_note_context_switch+0xbb9/0x1800 kernel/rcu/tree_plugin.h:320
Code: fd 04 68 00 4c 8b 4c 24 30 8b 4c 24 28 48 8b 54 24 20 e9 8f 03 00 00 48 c7 c7 c0 2a 4e 8a c6 05 73 2b f6 0c 01 e8 17 b5 dc ff <0f> 0b e9 4c f5 ff ff 81 e5 ff ff ff 7f 0f 84 d7 f6 ff ff 65 48 8b
RSP: 0018:ffffc9000327f008 EFLAGS: 00010082
RAX: 0000000000000000 RBX: ffff8880b983d4c0 RCX: 0000000000000000
RDX: ffff88808e925940 RSI: ffffffff814bc477 RDI: 0000000000000001
RBP: ffff88808e925940 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: ffff88808e925940 R14: ffffffff8e7b28b0 R15: ffff8880b983c5c0
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff21f494270 CR3: 0000000156476000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __schedule+0x276/0x5790 kernel/sched/core.c:6569
 schedule+0xde/0x1a0 kernel/sched/core.c:6745
 io_schedule+0xbe/0x130 kernel/sched/core.c:8987
 bit_wait_io+0x16/0xe0 kernel/sched/wait_bit.c:209
 __wait_on_bit+0x64/0x180 kernel/sched/wait_bit.c:49
 out_of_line_wait_on_bit+0xd9/0x110 kernel/sched/wait_bit.c:64
 wait_on_bit_io include/linux/wait_bit.h:101 [inline]
 __wait_on_buffer+0x63/0x70 fs/buffer.c:123
 wait_on_buffer include/linux/buffer_head.h:398 [inline]
 __ext4_get_inode_loc+0xac2/0x1330 fs/ext4/inode.c:4470
 __ext4_get_inode_loc_noinmem+0xb9/0x160 fs/ext4/inode.c:4489
 __ext4_iget+0x426/0x4430 fs/ext4/inode.c:4686
 ext4_lookup fs/ext4/namei.c:1851 [inline]
 ext4_lookup+0x387/0x700 fs/ext4/namei.c:1826
 __lookup_slow+0x24c/0x460 fs/namei.c:1690
 lookup_slow fs/namei.c:1707 [inline]
 walk_component+0x33f/0x5a0 fs/namei.c:1998
 link_path_walk.part.0+0x74e/0xd60 fs/namei.c:2325
 link_path_walk fs/namei.c:2250 [inline]
 path_openat+0x25c/0x2750 fs/namei.c:3787
 do_filp_open+0x1ba/0x410 fs/namei.c:3818
 do_sys_openat2+0x16d/0x4c0 fs/open.c:1356
 do_sys_open fs/open.c:1372 [inline]
 __do_sys_openat fs/open.c:1388 [inline]
 __se_sys_openat fs/open.c:1383 [inline]
 __x64_sys_openat+0x143/0x1f0 fs/open.c:1383
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f2737aada46
Code: 10 00 00 00 44 8b 54 24 e0 48 89 44 24 c0 48 8d 44 24 d0 48 89 44 24 c8 44 89 c2 4c 89 ce bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 76 0c f7 d8 89 05 0a 48 01 00 48 83 c8 ff c3 31
RSP: 002b:00007ffff7f33bb8 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007ffff7f33e18 RCX: 00007f2737aada46
RDX: 0000000000080000 RSI: 00007ffff7f33c30 RDI: 00000000ffffff9c
RBP: 00007ffff7f33c20 R08: 0000000000080000 R09: 00007ffff7f33c30
R10: 0000000000000000 R11: 0000000000000287 R12: 00007ffff7f33c30
R13: 0000000000000000 R14: 00007ffff7f33dff R15: 00000000ffffffff
 </TASK>

Crashes (15):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/05/14 21:35 linux-next e922ba281a8d 2b9ba477 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: sleeping function called from invalid context in alloc_buffer_head
2023/05/14 21:03 linux-next e922ba281a8d 2b9ba477 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: sleeping function called from invalid context in alloc_buffer_head
2023/05/14 14:52 linux-next e922ba281a8d 2b9ba477 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: sleeping function called from invalid context in alloc_buffer_head
2023/05/14 09:16 linux-next e922ba281a8d 2b9ba477 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: sleeping function called from invalid context in alloc_buffer_head
2023/05/14 07:46 linux-next e922ba281a8d 2b9ba477 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: sleeping function called from invalid context in alloc_buffer_head
2023/05/14 06:52 linux-next e922ba281a8d 2b9ba477 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: sleeping function called from invalid context in alloc_buffer_head
2023/05/11 01:53 linux-next 578215f3e21c 0fbd49f4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: sleeping function called from invalid context in alloc_buffer_head
2023/05/09 05:01 linux-next 52025ebbb518 f4168103 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: sleeping function called from invalid context in alloc_buffer_head
2023/05/08 21:37 linux-next 52025ebbb518 90c93c40 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: sleeping function called from invalid context in alloc_buffer_head
2023/05/08 19:33 linux-next 52025ebbb518 90c93c40 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: sleeping function called from invalid context in alloc_buffer_head
2023/05/07 14:30 linux-next 83e5775d7afd 90c93c40 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: sleeping function called from invalid context in alloc_buffer_head
2023/05/07 10:39 linux-next 83e5775d7afd 90c93c40 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: sleeping function called from invalid context in alloc_buffer_head
2023/05/07 03:44 linux-next 83e5775d7afd 90c93c40 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: sleeping function called from invalid context in alloc_buffer_head
2023/05/06 13:20 linux-next 83e5775d7afd 90c93c40 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: sleeping function called from invalid context in alloc_buffer_head
2023/05/05 11:36 linux-next 145e5cddfe8b 518a39a6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: sleeping function called from invalid context in alloc_buffer_head
* Struck through repros no longer work on HEAD.