ci2 starts bisection 2026-09-25 02:14:20.009169898 +0000 UTC m=+61.894646882 bisecting fixing commit since e4f7d8be268ecf717f94ee2e242afa79ddeacaed building syzkaller on 1e72964b0111319984575e60f266d1fa0a98abb5 ensuring issue is reproducible on original commit e4f7d8be268ecf717f94ee2e242afa79ddeacaed testing commit e4f7d8be268ecf717f94ee2e242afa79ddeacaed gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 6198559fc059fc4e58b21d407b1c6153c0629a6dae6809de320220af282971ee all runs: crashed: general protection fault in acpi_fan_probe representative crash: general protection fault in acpi_fan_probe, types: [DoS] check whether we can drop unnecessary instrumentation disabling configs for [memleak ubsan bug_or_warning kasan locking atomic_sleep hang], they are not needed testing commit e4f7d8be268ecf717f94ee2e242afa79ddeacaed gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: ac191bfaaa89c0e895a8f00e67cd78ff3d279830cee84fc41ab8050c1a12abc7 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in acpi_fan_probe representative crash: BUG: unable to handle kernel NULL pointer dereference in acpi_fan_probe, types: [NULL-POINTER-DEREFERENCE] the bug reproduces without the instrumentation disabling configs for [hang memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed kconfig minimization: base=3829 full=7621 leaves diff=2129 split chunks (needed=false): <2129> split chunk #0 of len 2129 into 5 parts testing without sub-chunk 1/5 disabling configs for [hang memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed testing commit e4f7d8be268ecf717f94ee2e242afa79ddeacaed gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 2c18df448671c988d411a98fb70ba4039f9ce429574ebc8694d7fc00943776e2 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in acpi_fan_probe representative crash: BUG: unable to handle kernel NULL pointer dereference in acpi_fan_probe, types: [NULL-POINTER-DEREFERENCE] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [hang memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed testing commit e4f7d8be268ecf717f94ee2e242afa79ddeacaed gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: e9794ccf36d0909ba6283347537643ebb8a7355cd7716c72650bdd19213528a1 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in acpi_fan_probe representative crash: BUG: unable to handle kernel NULL pointer dereference in acpi_fan_probe, types: [NULL-POINTER-DEREFERENCE] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [ubsan bug_or_warning kasan locking atomic_sleep hang memleak], they are not needed testing commit e4f7d8be268ecf717f94ee2e242afa79ddeacaed gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 9b5878581a0a2daf7cec388a9c2d20483d593c9ca4a6c1086872a2b8d19ec2b1 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in acpi_fan_probe representative crash: BUG: unable to handle kernel NULL pointer dereference in acpi_fan_probe, types: [NULL-POINTER-DEREFERENCE] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [bug_or_warning kasan locking atomic_sleep hang memleak ubsan], they are not needed testing commit e4f7d8be268ecf717f94ee2e242afa79ddeacaed gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: da1f3f309ccbf1664de55c4e43e4b44fdafe4602b9853d1e70ec42f906defaeb all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in acpi_fan_probe representative crash: BUG: unable to handle kernel NULL pointer dereference in acpi_fan_probe, types: [NULL-POINTER-DEREFERENCE] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [kasan locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed testing commit e4f7d8be268ecf717f94ee2e242afa79ddeacaed gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 54b5eb81c8ccc4bd003e41e056877cee9a25dd0f8c44383b7f0880c0280dce8d all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in acpi_fan_probe representative crash: BUG: unable to handle kernel NULL pointer dereference in acpi_fan_probe, types: [NULL-POINTER-DEREFERENCE] the chunk can be dropped disabling configs for [bug_or_warning kasan locking atomic_sleep hang memleak ubsan], they are not needed testing current HEAD 1a8763b93150b2c8f3992c27a5ce7857fee4ab0f testing commit 1a8763b93150b2c8f3992c27a5ce7857fee4ab0f gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 9ee71ce6d137427ffb0a61ca47f45a6e5f9c34c3c0b90b04ca1bc0d32fe4b088 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in acpi_fan_probe representative crash: BUG: unable to handle kernel NULL pointer dereference in acpi_fan_probe, types: [NULL-POINTER-DEREFERENCE] crash still not fixed/happens on the oldest tested release revisions tested: 8, total time: 4h1m10.82721534s (build: 35m8.949004852s, test: 1h21m58.057547568s) crash still not fixed or there were kernel test errors commit msg: Linux 6.1.188 crash: BUG: unable to handle kernel NULL pointer dereference in acpi_fan_probe BUG: kernel NULL pointer dereference, address: 0000000000000258 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 106b28067 P4D 106b28067 PUD 0 Oops: 0002 [#1] PREEMPT SMP CPU: 0 PID: 2582 Comm: syz.3.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:acpi_fan_probe+0x69/0x5b0 drivers/acpi/fan_core.c:326 Code: 49 83 c6 f0 31 db 84 c0 49 0f 45 de be 90 00 00 00 4c 89 ff ba c0 0d 00 00 e8 43 44 09 00 48 85 c0 0f 84 51 02 00 00 49 89 c6 <48> 89 83 58 02 00 00 49 89 84 24 88 00 00 00 48 8b 7b 08 48 c7 c6 RSP: 0018:ffffc90001993c60 EFLAGS: 00010282 RAX: ffff888106fd61a8 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff888104e47428 RSI: ffffffff823bd5f4 RDI: 00000000ffffffff RBP: ffffc90001993d18 R08: ffffffff8230d14e R09: 0000000000000090 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888104e47000 R13: ffffffff828169b0 R14: ffff888106fd61a8 R15: ffff888104e47010 FS: 00007f7b0dcaf6c0(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000258 CR3: 0000000107af9000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: platform_probe+0x60/0x90 drivers/base/platform.c:1400 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x143/0x470 drivers/base/dd.c:638 __driver_probe_device+0x97/0x120 drivers/base/dd.c:804 device_driver_attach+0x49/0xa0 drivers/base/dd.c:1131 bind_store+0xf6/0x160 drivers/base/bus.c:216 kernfs_fop_write_iter+0x12f/0x1a0 fs/kernfs/file.c:352 call_write_iter include/linux/fs.h:2271 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x30c/0x3f0 fs/read_write.c:584 ksys_write+0x70/0xf0 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f7b0de4e0d9 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:00007f7b0dcaf028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f7b0e0d5fa0 RCX: 00007f7b0de4e0d9 RDX: 0000000000000007 RSI: 0000200000000400 RDI: 0000000000000004 RBP: 00007f7b0dee5024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7b0e0d6038 R14: 00007f7b0e0d5fa0 R15: 00007ffdd5c30398 Modules linked in: CR2: 0000000000000258 ---[ end trace 0000000000000000 ]--- RIP: 0010:acpi_fan_probe+0x69/0x5b0 drivers/acpi/fan_core.c:326 Code: 49 83 c6 f0 31 db 84 c0 49 0f 45 de be 90 00 00 00 4c 89 ff ba c0 0d 00 00 e8 43 44 09 00 48 85 c0 0f 84 51 02 00 00 49 89 c6 <48> 89 83 58 02 00 00 49 89 84 24 88 00 00 00 48 8b 7b 08 48 c7 c6 RSP: 0018:ffffc90001993c60 EFLAGS: 00010282 RAX: ffff888106fd61a8 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff888104e47428 RSI: ffffffff823bd5f4 RDI: 00000000ffffffff RBP: ffffc90001993d18 R08: ffffffff8230d14e R09: 0000000000000090 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888104e47000 R13: ffffffff828169b0 R14: ffff888106fd61a8 R15: ffff888104e47010 FS: 00007f7b0dcaf6c0(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000258 CR3: 0000000107af9000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 49 83 c6 f0 add $0xfffffffffffffff0,%r14 4: 31 db xor %ebx,%ebx 6: 84 c0 test %al,%al 8: 49 0f 45 de cmovne %r14,%rbx c: be 90 00 00 00 mov $0x90,%esi 11: 4c 89 ff mov %r15,%rdi 14: ba c0 0d 00 00 mov $0xdc0,%edx 19: e8 43 44 09 00 call 0x94461 1e: 48 85 c0 test %rax,%rax 21: 0f 84 51 02 00 00 je 0x278 27: 49 89 c6 mov %rax,%r14 * 2a: 48 89 83 58 02 00 00 mov %rax,0x258(%rbx) <-- trapping instruction 31: 49 89 84 24 88 00 00 mov %rax,0x88(%r12) 38: 00 39: 48 8b 7b 08 mov 0x8(%rbx),%rdi 3d: 48 rex.W 3e: c7 .byte 0xc7 3f: c6 .byte 0xc6