ci2 starts bisection 2023-09-11 03:20:28.164035265 +0000 UTC m=+220216.437359928 bisecting fixing commit since 3ad342cf5b2cadf6408597d0cf086c31ab7ef383 building syzkaller on de870ca5ea0b42afdf670fa407254dc617342cc3 ensuring issue is reproducible on original commit 3ad342cf5b2cadf6408597d0cf086c31ab7ef383 testing commit 3ad342cf5b2cadf6408597d0cf086c31ab7ef383 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 33cd7b8f07b8bff5747b6ff98d3e5f9d513c497e0fa0782942833d282bff57bc all runs: crashed: kernel BUG in ext4_mb_load_buddy_gfp representative crash: kernel BUG in ext4_mb_load_buddy_gfp, types: [BUG] check whether we can drop unnecessary instrumentation disabling configs for [HANG LEAK UBSAN KASAN LOCKDEP ATOMIC_SLEEP], they are not needed testing commit 3ad342cf5b2cadf6408597d0cf086c31ab7ef383 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: a5b810d9ec7ad6d9306b1b179a9a702f81160343bda78e0974c78e20d7c12f52 all runs: crashed: kernel BUG in ext4_mb_load_buddy_gfp representative crash: kernel BUG in ext4_mb_load_buddy_gfp, types: [BUG] the bug reproduces without the instrumentation disabling configs for [UBSAN KASAN LOCKDEP ATOMIC_SLEEP HANG LEAK], they are not needed kconfig minimization: base=4789 full=6024 leaves diff=237 split chunks (needed=false): <237> split chunk #0 of len 237 into 5 parts testing without sub-chunk 1/5 disabling configs for [LEAK UBSAN KASAN LOCKDEP ATOMIC_SLEEP HANG], they are not needed testing commit 3ad342cf5b2cadf6408597d0cf086c31ab7ef383 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 53b92d73832f6d8d6dfe66659997bf0c3bcf976b622551e1af3019f6dbdff702 all runs: crashed: kernel BUG in ext4_mb_load_buddy_gfp representative crash: kernel BUG in ext4_mb_load_buddy_gfp, types: [BUG] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [ATOMIC_SLEEP HANG LEAK UBSAN KASAN LOCKDEP], they are not needed testing commit 3ad342cf5b2cadf6408597d0cf086c31ab7ef383 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 513c2858d323884eb764de2f4c59c28521f17741637369da5fecb6cd2434868d all runs: crashed: kernel BUG in ext4_mb_load_buddy_gfp representative crash: kernel BUG in ext4_mb_load_buddy_gfp, types: [BUG] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [HANG LEAK UBSAN KASAN LOCKDEP ATOMIC_SLEEP], they are not needed testing commit 3ad342cf5b2cadf6408597d0cf086c31ab7ef383 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: f180a7c299c3ada65e09eab5080a52b91670a84cfe960437bd9907dc0d70cd5f all runs: crashed: kernel BUG in ext4_mb_load_buddy_gfp representative crash: kernel BUG in ext4_mb_load_buddy_gfp, types: [BUG] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [LEAK UBSAN KASAN LOCKDEP ATOMIC_SLEEP HANG], they are not needed testing commit 3ad342cf5b2cadf6408597d0cf086c31ab7ef383 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: fc7a677f679ecbd50b0c29d7b33df77511e8836254023f52dfe23ad5ba91cf30 all runs: crashed: kernel BUG in ext4_mb_load_buddy_gfp representative crash: kernel BUG in ext4_mb_load_buddy_gfp, types: [BUG] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [KASAN LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed testing commit 3ad342cf5b2cadf6408597d0cf086c31ab7ef383 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 failed building 3ad342cf5b2cadf6408597d0cf086c31ab7ef383: net/socket.c:1109: undefined reference to `wext_handle_ioctl' net/socket.c:3378: undefined reference to `compat_wext_handle_ioctl' net/core/net-procfs.c:346: undefined reference to `wext_proc_exit' net/core/net-procfs.c:330: undefined reference to `wext_proc_init' minimized to 45 configs; suspects: [HID_ZEROPLUS USB_NET_MCS7830 USB_NET_NET1080 USB_NET_PLUSB USB_NET_RNDIS_HOST USB_NET_SMSC75XX USB_NET_SMSC95XX USB_NET_SR9700 USB_NET_SR9800 USB_NET_ZAURUS USB_OHCI_HCD USB_OHCI_HCD_PCI USB_OHCI_HCD_PLATFORM USB_OTG USB_OTG_FSM USB_PRINTER USB_SERIAL USB_SERIAL_FTDI_SIO USB_SERIAL_GENERIC USB_SERIAL_PL2303 USB_STORAGE_ALAUDA USB_STORAGE_CYPRESS_ATACB USB_STORAGE_DATAFAB USB_STORAGE_FREECOM USB_STORAGE_ISD200 USB_STORAGE_JUMPSHOT USB_STORAGE_KARMA USB_STORAGE_ONETOUCH USB_STORAGE_SDDR09 USB_STORAGE_SDDR55 USB_STORAGE_USBAT USB_TRANCEVIBRATOR USB_U_AUDIO USB_U_ETHER USB_U_SERIAL USB_WDM WLAN WLAN_VENDOR_ATH WLAN_VENDOR_ATMEL WLAN_VENDOR_BROADCOM WLAN_VENDOR_INTERSIL WLAN_VENDOR_MARVELL WLAN_VENDOR_MEDIATEK WLAN_VENDOR_MICROCHIP WLAN_VENDOR_RALINK WLAN_VENDOR_REALTEK WLAN_VENDOR_RSI WLAN_VENDOR_ZYDAS X86_X32 ZEROPLUS_FF] disabling configs for [KASAN LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed testing current HEAD a27512601c2d65569fdd5a843246dc8da96b6408 testing commit a27512601c2d65569fdd5a843246dc8da96b6408 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 12228d887e299e85e86767bfc742ca1687098893cc541d6939e590c29d177544 run #0: crashed: BUG: unable to handle kernel NULL pointer dereference in ext4_mb_new_blocks run #1: crashed: kernel BUG in ext4_mb_release_inode_pa run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK representative crash: BUG: unable to handle kernel NULL pointer dereference in ext4_mb_new_blocks, types: [UNKNOWN BUG] crash still not fixed/happens on the oldest tested release reproducer is flaky (1.00 repro chance estimate) revisions tested: 7, total time: 1h1m22.085850096s (build: 11m52.547143305s, test: 27m56.700404216s) crash still not fixed or there were kernel test errors commit msg: Merge 5.10.194 into android13-5.10-lts crash: BUG: unable to handle kernel NULL pointer dereference in ext4_mb_new_blocks EXT4-fs error (device loop0): ext4_get_group_desc:276: comm syz-executor.0: block_group >= groups_count - block_group = 4294963226, groups_count = 1 BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 113407067 P4D 113407067 PUD 11425b067 PMD 0 Oops: 0002 [#1] PREEMPT SMP CPU: 1 PID: 2950 Comm: syz-executor.0 Not tainted 5.10.194-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 RIP: 0010:arch_atomic_try_cmpxchg arch/x86/include/asm/atomic.h:202 [inline] RIP: 0010:atomic_try_cmpxchg_acquire include/asm-generic/atomic-instrumented.h:707 [inline] RIP: 0010:queued_spin_lock include/asm-generic/qspinlock.h:82 [inline] RIP: 0010:do_raw_spin_lock include/linux/spinlock.h:183 [inline] RIP: 0010:__raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline] RIP: 0010:_raw_spin_lock+0x19/0x40 kernel/locking/spinlock.c:151 Code: 89 c6 48 89 df e8 57 fd 40 ff 66 90 eb e2 0f 0b 90 55 48 89 e5 53 48 89 fb bf 01 00 00 00 e8 5e b5 3e ff 31 c0 ba 01 00 00 00 0f b1 13 75 06 48 8b 5d f8 c9 c3 48 83 3d 73 a1 eb 00 00 74 0e RSP: 0018:ffffc9000497f0c8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000001 RSI: ffffc9000497ee78 RDI: ffffffff81427f7f RBP: ffffc9000497f0d0 R08: 0000000000000001 R09: 0000000000000019 R10: 00000000ffffff8b R11: 0000000000000000 R12: ffff888108d881a0 R13: ffff888112cbb000 R14: ffff888109d71580 R15: ffffc9000497f260 FS: 00007f788bd986c0(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000001147f2000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: spin_lock include/linux/spinlock.h:354 [inline] ext4_mb_release_context fs/ext4/mballoc.c:4973 [inline] ext4_mb_new_blocks+0xb9f/0x1020 fs/ext4/mballoc.c:5191 ext4_ext_map_blocks+0x8a5/0x19a0 fs/ext4/extents.c:4281 ext4_map_blocks+0x19a/0x5b0 fs/ext4/inode.c:646 _ext4_get_block+0x8e/0x110 fs/ext4/inode.c:793 ext4_get_block+0x11/0x20 fs/ext4/inode.c:810 __block_write_begin_int+0x17d/0x620 fs/buffer.c:2042 __block_write_begin+0xc/0x10 fs/buffer.c:2092 ext4_convert_inline_data_to_extent fs/ext4/inline.c:619 [inline] ext4_try_to_write_inline_data+0x263/0x6b0 fs/ext4/inline.c:751 ext4_write_begin+0x575/0x6d0 fs/ext4/inode.c:1168 ext4_da_write_begin+0x234/0x580 fs/ext4/inode.c:3021 generic_perform_write+0xbe/0x1b0 mm/filemap.c:3506 ext4_buffered_write_iter+0x9f/0x150 fs/ext4/file.c:271 ext4_file_write_iter+0x5b/0x840 fs/ext4/file.c:685 __kernel_write+0x13e/0x2c0 fs/read_write.c:550 dump_emit+0x79/0xa0 fs/coredump.c:849 elf_core_dump+0x9f1/0xee0 fs/binfmt_elf.c:2242 do_coredump+0xcd3/0x1090 fs/coredump.c:811 get_signal+0x489/0x8a0 kernel/signal.c:2768 arch_do_signal_or_restart+0xeb/0x7d0 arch/x86/kernel/signal.c:805 handle_signal_work kernel/entry/common.c:145 [inline] exit_to_user_mode_loop kernel/entry/common.c:169 [inline] exit_to_user_mode_prepare+0xd1/0x120 kernel/entry/common.c:199 irqentry_exit_to_user_mode+0x9/0x20 kernel/entry/common.c:287 irqentry_exit+0x3c/0x60 kernel/entry/common.c:375 exc_page_fault+0x27f/0x5b0 arch/x86/mm/fault.c:1521 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:571 RIP: 0033:0x0 Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6. RSP: 002b:0000000020000473 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 0000000000000058 RCX: 00007f788c215959 RDX: 00007f788bd97fb0 RSI: 0000000000000058 RDI: 00007f788bd97fb0 RBP: 00007f788c271c88 R08: 0000000000000000 R09: 0000000000000058 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f788c334f80 R15: 00007ffeadf51f68 Modules linked in: CR2: 0000000000000000 ---[ end trace afe77875e1e14745 ]--- RIP: 0010:arch_atomic_try_cmpxchg arch/x86/include/asm/atomic.h:202 [inline] RIP: 0010:atomic_try_cmpxchg_acquire include/asm-generic/atomic-instrumented.h:707 [inline] RIP: 0010:queued_spin_lock include/asm-generic/qspinlock.h:82 [inline] RIP: 0010:do_raw_spin_lock include/linux/spinlock.h:183 [inline] RIP: 0010:__raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline] RIP: 0010:_raw_spin_lock+0x19/0x40 kernel/locking/spinlock.c:151 Code: 89 c6 48 89 df e8 57 fd 40 ff 66 90 eb e2 0f 0b 90 55 48 89 e5 53 48 89 fb bf 01 00 00 00 e8 5e b5 3e ff 31 c0 ba 01 00 00 00 0f b1 13 75 06 48 8b 5d f8 c9 c3 48 83 3d 73 a1 eb 00 00 74 0e RSP: 0018:ffffc9000497f0c8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000001 RSI: ffffc9000497ee78 RDI: ffffffff81427f7f RBP: ffffc9000497f0d0 R08: 0000000000000001 R09: 0000000000000019 R10: 00000000ffffff8b R11: 0000000000000000 R12: ffff888108d881a0 R13: ffff888112cbb000 R14: ffff888109d71580 R15: ffffc9000497f260 FS: 00007f788bd986c0(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000001147f2000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 89 c6 mov %eax,%esi 2: 48 89 df mov %rbx,%rdi 5: e8 57 fd 40 ff call 0xff40fd61 a: 66 90 xchg %ax,%ax c: eb e2 jmp 0xfffffff0 e: 0f 0b ud2 10: 90 nop 11: 55 push %rbp 12: 48 89 e5 mov %rsp,%rbp 15: 53 push %rbx 16: 48 89 fb mov %rdi,%rbx 19: bf 01 00 00 00 mov $0x1,%edi 1e: e8 5e b5 3e ff call 0xff3eb581 23: 31 c0 xor %eax,%eax 25: ba 01 00 00 00 mov $0x1,%edx * 2a: f0 0f b1 13 lock cmpxchg %edx,(%rbx) <-- trapping instruction 2e: 75 06 jne 0x36 30: 48 8b 5d f8 mov -0x8(%rbp),%rbx 34: c9 leave 35: c3 ret 36: 48 83 3d 73 a1 eb 00 cmpq $0x0,0xeba173(%rip) # 0xeba1b1 3d: 00 3e: 74 0e je 0x4e